更多“以下选项中，属于半导体激光器特性的是（）。”相关的问题
新兴工业化的主要特征包括( )。
A．科技含量高
B．经济效益好
C．开放程度高
D．人力资源优势得到充分发挥
E．资源消耗低
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关于并行通信与串行通信，说法正确的是？
A. 并行通信和串行通信是从同一时刻能传输的比特位数角度区分的，跟数据传输速率没有必然联系B. 并行通信由于一次能传输多个字节，因此比串行通信通信速率高C. 串行通信的可靠性比并行通信高D. 目前在嵌入式系统外围模块中，并行通信有更广泛的应用
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Being a man has always been dangerous. There are about 105 males born for every 100 females, but this ratio drops to near balance at the age of maturity, and among 70-year-olds there are twice as many women as men. But the great universal of male mortality is being changed. Now, by babies survive almost as well as girls do. This means that, for the first time, there will be an excess of boys in those crucial years when they are searching for a mate. More important, another chance for natural selection has been removed. Fifty years ago, the chance of a baby (particularly a boy baby) surviving depended on its weight. A kilogram too light or too heavy meant almost certain death. Today it makes almost no difference. Since much of the variation is due to genes one more agent of evolution has gone.There is another way to commit evolutionary suicide: stay alive, but have fewer children. Few people are as fertile as in the past. Except in some religious communities, very few women have 15 children. Nowadays the number of births, like the age of death, has become average. Most of us have roughly the same number of offspring. Again, differences between people and the opportunity for natural selection to take advantage of it have diminished. India shows what is happening. The country offers wealth for a few in the great cities and poverty for the remaining tribal peoples. The grand mediocrity of today everyone being the same in survival and number of offspring means that natural selection has lost 80% of its power in upper-middle-class India compared to the tribes.For us, this means that evolution is over; the biological Utopia has arrived. Strangely, it has involved little physical changes. No other species fills so many places in nature. But in the past 100,000 years even the past 100 years, our lives have been transformed but our bodies have not. We did not evolve, because machines and society did it for us. Darwin had a phrase to describe those ignorant of evolution—they "look at an organic being as average looks at a ship, as at something wholly beyond his comprehension". No doubt we will remember a 20th century way of life beyond comprehension for its ugliness. But however amazed our descendants may be at how far from Utopia we were, they will look just like us.
A．a perfectly adjusted social systemB．a perfectly evolved state of natureC．a practically left-behind societyD．an ideally organized society
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项目特种作业安全方面存在的主要问题有（）。
A.管理缺失B.违法发包，非法转包等现象普遍存在C.专业技术人才不足，检查、监管不力D.安全意识较高E.总包单位的管控能力不强
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胃蛋白酶在下列何种条件下才具有活性（）
A.pH4以上
B.pH为7
C.pH3以下
D.需要有胆汁的激活
E.需要有乙醇激活
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润滑剂能减少震动使机械能变为（）
A.液压能
B.动能
C.热能
D.势能
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安装软件的过程是：（）。
A.安装应用程序 B.硬盘的分区和格式化 C.安装操作系统 D.安装驱动程序
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\tThat Louise Nevelson is believed by many critics to be the greatest twentieth-century sculptor is...Which of the following statement about Nevelson’ sculpture can be inferred from the passage（）
\tA．They are meant for display.
\tB．They are often painted in several colors.
\tC．They are sometimes very large.
\tD．They are hand-carved.
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小王承担了某信息处理项目,按计划进度在应完成日向领导做了汇报,将计划 进度与实际进度画出了如下两条曲线.从该图可以看出,与计划进度相比,实际进度(69)。
A. 比较快，提前完成了任务 B. 先慢后快，延迟完成了任务 C. 先慢后快，按时完成了任务 D. 先快后慢，至今尚未完成任务
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根据国内运输货物保险条款的规定，如果收货人未及时提货，保险责任终止期限为（）。
A.最多延长至以收货人接到到货通知单后10天为限
B.最多延长至以收货人接到到货通知单后15天为限
C.最多延长至以收货人接到到货通知单后30天为限
D.最多延长至以收货人接到到货通知单后60天为限
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代理报检单位注册信息发生变更，企业向检验检疫机构办理更改手续的时限是（ ）。A. 信息变更之前B. 信息变更之日起 15 日内C. 信息变更之日起 30 日内D. 信息变更之日起 60 日内
男性，45岁，心前区持续性疼痛1周，查体示重病容，体温38.8℃，血压100/70mmHg，颈静脉怒张，心界向两侧扩大，心率120次／分，心音弱，心律整，无杂音，心电图Ⅰ、Ⅱ、Ⅲ、aVF、aVL、V1至V5导联，ST段弓背向下抬高，T波倒置，最可能的诊断是（）
A.急性下壁兼广泛前壁心肌梗死
B.变异型心绞痛
C.中间综合征
D.急性肺动脉栓塞
E.急性心包炎
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金属材料常用测定硬度的方法有布氏硬度和洛氏硬度。
A.对 B.错
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能否在课堂上形成一种理想的心理氛围，主要取决于（ ）。
能否在课堂上形成一种理想的心理氛围，主要取决于（ ）。
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旅游行业管理的目的是()。
A.引导市场趋势B.维护市场秩序C.制定市场价格D.保护旅游者合法权益E.干预旅游企业的经营
B.维护市场秩序C.制定市场价格D.保护旅游者合法权益E.干预旅游企业的经营
C.制定市场价格D.保护旅游者合法权益E.干预旅游企业的经营
D.保护旅游者合法权益E.干预旅游企业的经营
E.干预旅游企业的经营
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