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问题
多项选择题
采煤工作面出煤量的计算按照()相乘计算。
A.比重
B.采向
C.工作面平均长度
D.推进进尺
答案
参考答案:
A, B, C, D
填空题
若角α的余角与角α的补角的和是平角,则角α=______度.
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选择题
—Where is your English teacher? I'm looking for him everywhere.
—He _______ the Internet in the computer room.
A. will search
B. has searched
C. searched
D. is searching
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