更多“公元前3000余年创造楔形文字的是（）。”相关的问题
属于喜凉作物的是( )
A. 谷子、大豆 B. 棉花、水稻 C. 玉米、花生 D. 小麦、油菜
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缺氧伴有二氧化碳滞留的患者，高浓度给氧可引起（ ）
A.恶心、呕吐 B.烦躁不安 C.面色苍白 D.二氧化碳麻醉 E.进行性呼吸困难
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机组要小心使用加速方式（爬升或下降），因为（）
A . 系统不考虑速度限制和速度极限
B . 系统不考虑高度限制
C . 以上都对
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蓄热室在周期内的传热可以看成废气传给格子砖的热量和格子砖传给冷气体的热量是相等的。
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下列哪一种细胞是适应性免疫应答中抗肿瘤免疫的主要效应细胞
A. Th2细胞B. Treg细胞C. CTLD. B细胞E. NK细胞
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How do the professional timekeepers of the world determine, to the precise nanosecond, when a new year begins They simply consult an atomic clock. At the end of last month, just in time to ring in the new year, the Hewlett-Packard company, of Palo Alto, California, unveiled the latest of these meticulous time- pieces. For nearly 30 years, the firm has been supplying military and scientific clients with atomic clocks; the most advanced models neither gain nor lose more than a second every 800,000 years. But the newest version, a $54,000 device the size of desktop computer, is accurate to one second in 1.6 million years — far longer than all of human history to date. It is natural to wonder who could possibly need such precision. The answer: practically everyone, at least indirectly. Telephone and computer networks rely on atomic clocks to synchronize the flow of trillions of bits of information around the nation and the world, thus avoiding mammoth electronic logjams. Television and radio stations use the clocks to time their broadcasts. Satellite- based navigation systems depend on the devices to measure the arrival time of radio signals to within a tiny fraction of a second, allowing users to gauge their location to within a few feet. The armed forces use atomic clocks to help steer smart missiles and time secret calls to nuclear submarines around the world. And scientists depend on atomic clocks to help track the almost imperceptible motions of continents across the surface of the earth and galaxies and stars across the sky. Even the people who dropped the ball in New York City’s Times Square to signal the start of 1992 relied on a timekeeping source that was pegged ultimately to an atomic clock. The principle that lies behind all this precision comes out of quantum physics. When an atom is bombarded with electromagnetic radiation — in this case, microwaves — its electrons shift into a new energy state. Each type of atom responds most readily to a particular frequency of radiation. That means that when a microwave beam inside the clock is set exactly to that frequency, the maximum number of atoms will undergo the energy shift. This signals the clock’s internal computer that the device is correctly tuned. And in fact, it is the vibrating microwaves that keep time; the atoms are used just to keep them on track. Theoretically, an atomic clock could keep perfect time, but the actual performance depends on engineering details — exactly how the microwaves hit the cesium atoms, how sophisticated the electronics are and so on. It was by improving factors like these that Hewlett-Packard boosted its clocks’ performance from incredibly good to even better. The next generation of clocks should do better still, but no one is sure when that generation will come along. For now, a second every million and a half years will have to do.
A. telephone and computer networks rely on atomic clocks to synchronize the exchange of information around the world.B. the armed forces use atomic clocks to encode their secret calls to submarines around the world.C. scientists use atomic clocks to gauge the location of continents across the surface of the earth.D. the people who dropped the ball in New York City’s Times Square to signal the start of 1992 carried with them an atomic clock.
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《党政领导干部选拔任用工作条例》规定，有下列情形之一的，不得列为考察对象：（）
A.群众公认度不高的 B.近三年年度考核结果中有被确定为基本称职以下等次的 C.有跑官、拉票行为的 D.配偶已移居国（境）外；或者没有配偶，子女均已移居国（境）外的 E.受到组织处理或者党纪政纪处分影响使用的
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玉米的小孢子母细胞为（）。
A.2n
B.n
C.3n
D.4n
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患者,女性,42 岁,昏迷,护士遵医嘱给予口腔护理,护士为患者进行口腔护理措施不正确的是( )
A. 让患者平卧、头偏向一边 B. 用张口器从门齿处放入，不可施暴力助其张口 C. 先将假牙取下，浸于清水中保存 D. 用血管钳夹紧棉球，每次夹 1 个，防止棉球遗留口腔内 E. 棉球蘸水不可过湿，禁忌漱口以免呛咳或引起吸入性肺炎
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个案工作采用（）的专业服务方式。
A.多对一
B.一对二
C.二对多
D.一对一
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接入网网管系统采用（）体系。
A.主从 B.分布式 C.客户端与服务器 D.集中式
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男性，26岁，近一月来出现贫血，发热伴出血一周。Hb60g／L，白细胞4．3×109／L，分类正常；骨髓中原粒细胞10％，早幼粒细胞52％，凝血酶原时间18s，正常对照13s，血浆纤维蛋白原0．15g／L。最可能的诊断是（）
A.急性型原发性血小板减少性紫癜 B.急性型再生障碍性贫血 C.M3型白血病并发DIC D.急性感染并发DIC E.脾脏功能亢进
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压力测试是指对银行保险业务中突发小概率事件等极端不利情况可能对银行或保险公司造成的潜在损失进行估算。
A . 正确
B . 错误
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杆件产生剪切变形时，其受力特点是（)。A.杆件沿轴线方向拉伸或压缩B.杆轴由直线变成曲线C.杆件的各
杆件产生剪切变形时，其受力特点是()。A.杆件沿轴线方向拉伸或压缩B.杆轴由直线变成曲线C.杆件的各横截面将绕轴线产生相对转动D.杆件介于两力之间的截面沿外力作用方向产生相对错动变形
A.杆件沿轴线方向拉伸或压缩B.杆轴由直线变成曲线C.杆件的各横截面将绕轴线产生相对转动D.杆件介于两力之间的截面沿外力作用方向产生相对错动变形
B.杆轴由直线变成曲线C.杆件的各横截面将绕轴线产生相对转动D.杆件介于两力之间的截面沿外力作用方向产生相对错动变形
C.杆件的各横截面将绕轴线产生相对转动D.杆件介于两力之间的截面沿外力作用方向产生相对错动变形
D.杆件介于两力之间的截面沿外力作用方向产生相对错动变形
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