问题
单项选择题
单元制发电机组的等效可用系数应达（）以上。
A.70％；
B.90％；
C.80％；
D.95％。
答案
参考答案：B
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单元制发电机组的等效可用系数应达（）以上。
A.70％；
B.90％；
C.80％；
D.95％。
参考答案：B
| 用方框里的词填空，使句意正确，注意大小写 | |
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