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问题
单项选择题
架线附件安装时，作业区间（）应装设保安接地线。
A.一侧
B.前方
C.两端
D.后方
答案
参考答案：
C
选择题
He was so pleased with all _____ we had done for him _____ he wrote us a letter to praise us for it.
A. what; what
B. what; that
C. that; what
D. that; that
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填空题
发电厂的设备管理必须保证其设备在计划发电期限内做到（）的连续发电。
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