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问题
单项选择题
光伏电站并网点电压低于50％标称电压时，要求电站最大分闸时间为（）s。
A.0.05
B.0.1
C.1
D.2
答案
参考答案：B
选择题
This is the hotel _____ last month.
A. which they stayed
B. at that they stayed
C. where they stayed at
D. where they stayed
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问答题 简答题
影响系统维护工作量的因素有哪些？
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