问题
单项选择题
保护直配电机用的避雷线，对电导线的保护角（）。
A.应大于35°且小于60°
B.应大于30°且小于45°
C.不应大于30°
D.不应大于25°
答案
参考答案：C
解析：
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保护直配电机用的避雷线，对电导线的保护角（）。
A.应大于35°且小于60°
B.应大于30°且小于45°
C.不应大于30°
D.不应大于25°
参考答案：C
解析：
Soon it would be the holidays, but before that, there were year exams. All the ___11___ had been working hard for some time, reviewing their lessons for the exams. If they didn’t __12___, they would have to retake them in September. There were usually a few who ___13___, but Jane didn’t want to be one of them. She had worked hard all year, but just before the exams she was working so hard that her sister Barbara was ___14___ about her. She went to bed too__15___. The night before the first exam, Barbara __16___ that she have an early night and take a __17___ pill（药丸）. She promised to wake her up in the morning. As she was falling asleep, Jane was afraid that she might oversleep. Her ___18___ kept jumping from subject to subject. At last, with the help of ___19___, she went to sleep. In no time at all, she was sitting in the examination hall, looking at the examination ___20____, but she couldn’t answer any of the questions. Everyone around her was writing pages and gages. Though she thought hard, she couldn’t find anything to write about . She kept looking at her ___21____. Time was running out. There was only an hour to go. She started one question, wrote two sentences, ___22____ and tried another one. With only half an hour left she wrote another two sentences. By this time she was so worried that she started ___23___. Her whole body shook. It shook so much that she ___24___ up. She was still in bed and it had all been a ___25____ dream. A minute later, Barbara called her name.
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