减少供电线路电能损失,减少电压损失,提高末端电压宜采取无功就地补偿。

题型:判断题

问题:

减少供电线路电能损失,减少电压损失,提高末端电压宜采取无功就地补偿。

考点:变电检修工考试变电检修工考试题库
题型:判断题

在核磁共振氢谱中出现两组峰,其氢原子数之比为3:2的化合物是

[     ]

A.

B.

C.

D.

题型:判断题

句型转换。

1. The doctor asked the old man to stop smoking. (改为一般疑问句)

    ________ the doctor ________  the old man to stop smoking?

2. The girl is clever. She can work out difficult problems. (合并为一句)

    It is clever ________  the girl ________ work out difficult problems.

3. I prefer doing everything for myself to asking my mother for help. (保持句意基本不变)

    I would ________  do everything for myself ________  ask my mother for help.

4. Those local businesses supported the charity show. (改为被动语态)

    The charity show ________  ________  by those local businesses.

5. Martin was so excited at the news that he couldn't fall asleep. (改为简单句)

    Martin was ________  excited at the news ________  fall asleep.

题型:判断题

下列符合典型心绞痛表现的是()

A.常突然发生而迫使病人立即停止活动

B.疼痛放射至左肩及左上肢内侧

C.疼痛发生在左心前区

D.在体力负荷、情绪激动时发生

E.疼痛历时3~5分钟

题型:判断题

引起齿轮噪声和振动的主要因素是()速比变动。

A.高频

B.周期

C.短期

题型:判断题

提速道岔空转经过()时间,自动切断电源,经操纵后能返回原来的位置。

A.3min

B.3s

C.30s

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