试题与答案

总配电箱中漏电保护器的额定漏电动作电流应大于30mA。额定漏电动作时间应大于0.1s

题型:判断题

题目:

总配电箱中漏电保护器的额定漏电动作电流应大于30mA。额定漏电动作时间应大于0.1s,但其额定漏电动作电流与额定漏电动作时间的乘积应大于30MA·s。

答案:

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参考答案:充模、压实、倒流、冻结冷却

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Several years ago, a farmer owned some land along the sea. He advertised for workers, but no one wanted to work for him. Most people didn’t want to work there   31  they didn’t like the bad storms. Finally, a   32  man, who looked weak and more than fifty years old, came to see the farmer. “Are you a good farmhand?” the farmer asked him.
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Although the answer was strange, the farmer let the man stay to work. The little man worked   34  around the farm, busy from morning till evening. The farmer felt very pleased with his work.
Then one night the wind began to blow strongly. Jumping out of the bed, the farmer   35  into the little man’s room. He shook the little man and cried, “Get up! A   36  is coming!”
The little man said slowly, “No sir, I told you----I can   37  well when the wind blows.”
The farmer was very angry, but he had to hurry outside to get ready for the storm. To his   38  , everything was ready outside.   39  could be blown away.
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