In 1971 there were about 3,700 million
people in the world. If the population were{{U}} (21) {{/U}}evenly over
the earth’ s surface there would be about 50 people to the square mile; but
there are vast areas of desert and mountain and tropical forest{{U}} (22)
{{/U}}are uninhabited,{{U}} (23) {{/U}}at the other{{U}} (24)
{{/U}}, in the great cities millions may live within a few square
miles. {{U}} (25) {{/U}}of the world’ s population is concentrated on only a small{{U}} (26) {{/U}}of the earth’ s land surface, in the rich valleys and{{U}} (27) {{/U}}plains, because people up to the present time have{{U}} (28) {{/U}}to congregate in place where the climate and soil make it easy to grow food and obtain shelter. A{{U}} (29) {{/U}}world population and the discoveries of science{{U}} (30) {{/U}}this pattern of distrib A. scattered B. restrained C. separated D. resembled [名词解释]检测诊断法
[填空题]生态系统的能量来源主要是______。
[判断题]临时拉线应在永久拉线全部安装完毕承力后方可拆除。
A.正确 B.错误 [单项选择]电信运营支撑系统中,经营分析子系统的功能一般不包括()。
A. 综合数据处理 B. 关键经营指标监控 C. 业务综合分析 D. 网络性能状态分析 [单项选择]工程造价资料不包括( )。
A. 设计概算 B. 工程量计算规则 C. 竣工决算 D. 施工预算 [单选题]需要手摇道岔时,双机牵引道岔至少需要()人,其中一人岗位职务必须是车站值班员及以上。
A.2 B.3 C.1 D.4 [单选题]下列属于汽车总成修理质量评价指标的是( )。
A.原材料力学性能 B.车身外形的恢复程度 C.振动和噪声水平 D.静.动平衡程度 [判断题]提高道床横向阻力是增强无缝线路稳定性的有效措施。( )
A.正确 B.错误 [多选题]工作地点,应停电的线路和设备中,包含危及线路停电作业安全,且不能采取相应安全措施的()线路。
A.交叉跨越 B.平行线路 C.同杆(塔)架设 D.通讯线路 [单选题]厦门地铁2号线手动关门过程中,门控器收到关门信号后,延时() 秒门开始关闭。
A.0.5 B.1 C.2 D.3 我来回答: 提交
|