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问题
填空题
从100里连续减5,到结果为0时,一共减去( )个5。
答案
20
单项选择题
智能变电站中的IED表示()。
A.计算机监控系统
B.保护装置
C.测控单元
D.智能电子设备
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选择题
---Will Li Ming attend the concert by Jay Chou?
---No. He _____ for the coming speech contest lately.
A. prepared
B. was preparing
C. has been preparing
D. has prepared
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