更多“在现实基站天线的使用中只有全向天线。（）”相关的问题
下列关于无线宽带接入市场驱动力的技术因素错误的是（）。
A.光缆接入巨大投入――有限的资金 B.终端设备的可移动性――一般的固定接入难以完成 C.光缆建成后不可移动性――客户发展是否成功的风险 D.客户不再使用光纤接入――光纤接入已淘汰
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下列说法中正确的有（ ）。
A.弹性预算法适用于与业务量有关的预算的编制 B.因为制造费用的发生与生产有关，所以制造费用预算的编制要以生产预算为基础 C.定期预算法便于依据会计报告的数据与预算的比较，有利于前后各个期间的预算衔接 D.管理费用预算一般以过去的实际开支为基础，按预算期的可预见变化来调整
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经济法调整的对象包括（ ）。
A.社会管理关系 B.经济管理关系 C.组织管理性的协作关系 D.市场管理关系 E.组织管理性的流转关系
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（）是一种在印度尼利亚常见的采收处理方式，在咖啡豆仍有高含水率时进行脱壳，接着干燥。此处理法会让咖啡风味中添加特殊的泥土气息。
A.GRADING
B.GUMILLA
C.GILINGBASAH
D.GROWING
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猪疥螨病的确诊要靠实验室检验，在采集病料时，最好选择在（）刮取病料。
A、患部皮肤处
B、健康皮肤处
C、病健皮肤交界处
D、以上均可
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以下各项措施中，能有效防治酸雨的是（）
A、 减少二氧化硫和氮氧化物的排放
B、 禁止排放氟氯烃,研制新的制冷系统
C、 植树造林,扩大森林覆盖率
D、 发展煤炭生产
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下列提法正确的是A、甲类传染病病人和病原携带者、肺炭疽病人必须强制隔离治疗B、乙类传染病中的重
下列提法正确的是A、甲类传染病病人和病原携带者、肺炭疽病人必须强制隔离治疗B、乙类传染病中的重症肝炎、中毒性痢疾病人必须强制隔离治疗C、为消灭脊髓灰质炎，该病病人一律隔离治疗D、狂犬病病人、流行性出血热病人必须强制隔离治疗E、艾滋病感染者就是艾滋病人
A、甲类传染病病人和病原携带者、肺炭疽病人必须强制隔离治疗B、乙类传染病中的重症肝炎、中毒性痢疾病人必须强制隔离治疗C、为消灭脊髓灰质炎，该病病人一律隔离治疗D、狂犬病病人、流行性出血热病人必须强制隔离治疗E、艾滋病感染者就是艾滋病人
B、乙类传染病中的重症肝炎、中毒性痢疾病人必须强制隔离治疗C、为消灭脊髓灰质炎，该病病人一律隔离治疗D、狂犬病病人、流行性出血热病人必须强制隔离治疗E、艾滋病感染者就是艾滋病人
C、为消灭脊髓灰质炎，该病病人一律隔离治疗D、狂犬病病人、流行性出血热病人必须强制隔离治疗E、艾滋病感染者就是艾滋病人
D、狂犬病病人、流行性出血热病人必须强制隔离治疗E、艾滋病感染者就是艾滋病人
E、艾滋病感染者就是艾滋病人
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就引起视疲劳而言，（）最深。
A.蓝，紫色
B.红，橙色
C.黄，绿色
D.绿，蓝色
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混凝土中细骨料最常用的是( )。 A．山砂 B．海砂 C．河砂 D．人工砂
A.山砂
B.海砂
C.河砂
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在教授学员慢飞动作时，应建立和保持什么样的速度（）
A、功率曲线后段，和个操纵面始终保持向后的位置
B、保持失速警告器警告，和可改出失速的速度
C、着陆进近速度和飞行中减小的速度
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访员的常规训练包括（）。
A.态度训练
B.技能训练
C.问题处理训练
D.市场调查专业知识的培训
E.身体素质训练
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Text 4 Virtually everything astronomers know about objects outside the solar system is based on the detection of photons-quanta of electromagnetic radiation. Yet there is another form of radiation that permeates the universe: neutrinos. With (as its name implies) no electric charge, and negligible mass, the neutrino interacts with other particles so rarely that a neutrino can cross the entire universe, even traversing substantial aggregations of matter, without being absorbed or even deflected. Neutrinos can thus escape from regions of space where light and other kinds of electromagnetic radiation are blocked by matter. Not a single, validated observation of an extraterrestrial neutrino has .so far been produced despite the construction of a string of elaborate observatories, mounted on the earth from Southern India to Utah to South Africa. However, the detection of extraterrestrial neutrinos are of great significance in the study of astronomy. Neutrinos carry with their information about the site and circum stances of their production; therefore, the detection of cosmic neutrinos could provide new information about a wide variety of cosmic phenomena and about the history of the universe. How can scientists detect a particle that interacts .so infrequently with other matter Twenty-five years passed between Pauli’s hypothesis that the neutrino existed and its actual detection; since then virtually all research with neutrinos has been with neutrinos created artificially in large particle accelerators and studied under neutrino microscopes. But a neutrino telescope, capable of detecting cosmic neutrinos, is difficult to construct. No apparatus can detect neutrinos unless it is extremely massive, because great mass is synonymous with huge numbers of nucleons (neutrons and protons), and the more massive the detector, the greater the probability of one of its nucleon’s reacting with a neutrino. In addition, the apparatus must be sufficiently shielded from the interfering effects of other particles. Fortunately, a group of astrophysicists has proposed a means of detecting cosmic neutrinos by harnessing the mass of the ocean. Named DUMAND, for Deep Underwater Muon and Neutrino Detector, the project calls for placing an array of light sensors at a depth of five kilometers under the ocean surface. The detecting medium is the sea water itself: when a neutrino interacts with a particle in an atom of seawater, the result is a cascade of electrically charged particles and a flash of light that can be detected by the sensors. The five kilometers of seawater above the sensors will shield them from the interfering effects of other high-energy particles raining down through the atmosphere. The strongest motivation for the DUMAND project is that it will exploit an important source of information about the universe. The extension of astronomy from visible light to radio waves to x-rays and gamma rays never failed to lead to the discovery of unusual objects such as radio galaxies, quasars, and pulsars. Each of these discoveries came as a surprise. Neutrino astronomy will doubtlessly bring its own share of surprises.
Text 4
Virtually everything astronomers know about objects outside the solar system is based on the detection of photons-quanta of electromagnetic radiation. Yet there is another form of radiation that permeates the universe: neutrinos. With (as its name implies) no electric charge, and negligible mass, the neutrino interacts with other particles so rarely that a neutrino can cross the entire universe, even traversing substantial aggregations of matter, without being absorbed or even deflected. Neutrinos can thus escape from regions of space where light and other kinds of electromagnetic radiation are blocked by matter. Not a single, validated observation of an extraterrestrial neutrino has .so far been produced despite the construction of a string of elaborate observatories, mounted on the earth from Southern India to Utah to South Africa. However, the detection of extraterrestrial neutrinos are of great significance in the study of astronomy. Neutrinos carry with their information about the site and circum stances of their production; therefore, the detection of cosmic neutrinos could provide new information about a wide variety of cosmic phenomena and about the history of the universe.
How can scientists detect a particle that interacts .so infrequently with other matter Twenty-five years passed between Pauli’s hypothesis that the neutrino existed and its actual detection; since then virtually all research with neutrinos has been with neutrinos created artificially in large particle accelerators and studied under neutrino microscopes. But a neutrino telescope, capable of detecting cosmic neutrinos, is difficult to construct. No apparatus can detect neutrinos unless it is extremely massive, because great mass is synonymous with huge numbers of nucleons (neutrons and protons), and the more massive the detector, the greater the probability of one of its nucleon’s reacting with a neutrino. In addition, the apparatus must be sufficiently shielded from the interfering effects of other particles.
Fortunately, a group of astrophysicists has proposed a means of detecting cosmic neutrinos by harnessing the mass of the ocean. Named DUMAND, for Deep Underwater Muon and Neutrino Detector, the project calls for placing an array of light sensors at a depth of five kilometers under the ocean surface. The detecting medium is the sea water itself: when a neutrino interacts with a particle in an atom of seawater, the result is a cascade of electrically charged particles and a flash of light that can be detected by the sensors. The five kilometers of seawater above the sensors will shield them from the interfering effects of other high-energy particles raining down through the atmosphere.
The strongest motivation for the DUMAND project is that it will exploit an important source of information about the universe. The extension of astronomy from visible light to radio waves to x-rays and gamma rays never failed to lead to the discovery of unusual objects such as radio galaxies, quasars, and pulsars. Each of these discoveries came as a surprise. Neutrino astronomy will doubtlessly bring its own share of surprises.
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关于路基工程冬期可进行的项目，下列说法正确的是（ ）。
A.整修路基边坡 B.铲除原地面的草皮、挖掘填方地段的台阶 C.含水量高的流动土质、流沙地段的路堑可利用冻期开挖 D.地质不良地区的二级以下公路路堤
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关于原核RNA聚合酶叙述正确的是（）。
A.原核RNA聚合酶有3种
B.由4个亚基组成的复合物
C.全酶中包括一个σ因子
D.全酶中包括两个β因子
E.全酶中包括一个α因子
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