因供电设施计划检修需要对电力客户停电时，供电企业应当提前（）通过客户或者进行公告。
A.3天；
B.5天；
C.7天；
D.10天
参考答案：C
—What did the headmaster _______ at the meeting?
—Sorry. I left the meeting before he _______.[ ]
A. say; said
B. say; spoke
C. speak; said
D. speak; spoke
带式烧结机本体主要由哪几部分构成？
