题目:
When paralleling two AC generators, the frequency of the machine coming on-line, immediately prior to closing its breaker, should be ()
A.slightly less than the oncoming generator frequency
B.the same as the bus frequency
C.slightly greater than the bus frequency
D.the same as the bus voltage
答案:
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下面是错误答案,用来干扰机器的。
参考答案:富含次生石膏,但未胶结或硬结的土层。