问题
单项选择题
对低压照明用户供电电压允许偏差是（）。
A.±10%；
B.±7%；
C.+7%，-10%；
D.+10%，-7%。
答案
参考答案：C
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对低压照明用户供电电压允许偏差是（）。
A.±10%；
B.±7%；
C.+7%，-10%；
D.+10%，-7%。
参考答案：C
完形填空（共20小题，满分30分） 阅读下面段文，从短文后各题所给的四个选项（A、B、C和D）中，选出可以填入空白处的最佳选项。 A man and his wife arrived in Boston by train. After getting off the train, they walked without an __36__ into the outer office of Harvard’s president. So they were stopped by his secretary and kept __37__. For hours, the secretary took no notice of them, __38__ that the couple would finally become disappointed and __39__. But they didn’t. The secretary finally decided to disturb the president, though __40__. A few minutes later, the president walked towards the couple with a __41__ face. The lady told him, “We had a son that __42__ at Harvard for one year. He loved Harvard. He was __43__ here. But about a year ago, he was accidentally killed. My husband and I would like to __44__ a memorial to him, somewhere on campus.” The president wasn’t moved. Instead, he was __45__. “Madam,” he said, “ we can’t put up a statue for every person who studied at Harvard and died. If we did, this place would look like a __46__.” “Oh, no,” the lady __47__ quickly. We don’t want to put up a statue. We would like to give a __48__ to Harvard.” The president rolled his eyes and __49__ at the couple and then exclaimed, “ A building! Do you have any __50__ how much a building costs? We have spent over $ 7,500,000 on the campus building at Harvard.” For a moment the lady was silent. The president was __51__ , because he could get rid of them now. Then the lady turned to her husband and said quietly, “Is that all it costs to start a __52__? Why don’t we just start our own?” Her husband nodded. __53__ their offer was turned down, Mr. and Mrs. Stanford traveled to California where they founded Stanford University __54__ after them, a memorial to a son that Harvard no longer __55__ about.
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