检修好的继电器要在规定的条件下进行（）动作实验。A.10min200次 B.10mi

What will the city of the future look like? No one knows for sure, and making小题1:______(predict) is a risky business. But one thing is certain-they are going to get bigger before they get smaller. In the future, care for the environment will become very important 小题2:_______earth’s natural resources run out. We will use lots of小题3:_______(recycle) materials, such as plastic, steel, glass, wood and paper, and we will waste fewer natural小题4:_______.We will also have to rely more小题5: _______ alternative energy, such as solar and wind power. All this seems certain, but there are plenty of things about city life in the future 小题6: _______ are not certain.

某项固定资产的原始价值为100 000元，预计净残值率为10%，预计使用年限5年。如果企业采用年数总和法计提折旧，第三年应计提的折旧额为( )元；

A．30 000

B．24 000

C．18 000

D．6 000

以下化验中，哪项不必要

A．尿三杯试验

B．ASO

C．抗核抗体

D．CH50+C3

E．BUN+Cr

由项目监理机构的专业监理工程师编写，并经总监理工程师批准实施的监理文件是 ( )。

A．监理大纲

B．监理规划

C．监理实施细则

D．监理合同

飞鸟的集体自杀是大自然的一个难解之谜。当今一个通行的说法是：鸟类集体自杀主要是地球磁极的移动使它们看不准定向标。

以下哪项如果为真最能削弱上述专家的观点？（）

A．空中漂浮的大量毒气云团是飞鸟致死的元凶

B．飞鸟的集体死亡一般是大自然的偶然事件

C．飞鸟吃了河海里以有毒藻类为食的虾蟹致死

D．火山爆发产生大量硫化物造成飞鸟集体死亡