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测量不对称三相四线制电路的功率，可用三只单相功率表测量。（）
A . 正确
B . 错误
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Bribery may lead to murder. A month ago reporters rushed to the(1)of a crime. At the spot the detective seemed even hardly aware of their(2)as he did his work. He carefully searched for(3)over every inch of the house. After a while, he bent over to pick up a small torn(4)of fabric. Nothing could(5)from his search. The detective(6)that this piece of fabric was(7)from the murderer's clothing during a struggle. The(8)had been the finance director of a very large computer hardware manufacturer. His wife, a timid woman,(9)everything she knew with the detective, including a hot(10)her husband had with some of the company's top executives at a banquet. There had been a scandal(11)bribery at his company. He was(12)the business of many of the top executives. He had(13)that some people were giving special favors to government officials to get(14). He often questioned their moral(15)and told them that he would accuse them if they were doing something they shouldn't,(16)caused problems for him. His questioning and accusing often left him at(17)with many of the executives. This time it had led to a(18)blow on his head. The detective caught(19)of a crucial clue, a brass button in the corner. It was from a jacket of one of the top executives. Later this executive and the company's president was(20). Of course this is not the end of the story.
（）拖拉机采用无架式车架。?