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问题
单项选择题
爆破器材存储仓库的库房内()住宿。
A.一般不可
B.严禁不相关人员
C.不能
D.严禁
答案
参考答案:D
选择题
— You are late. The meeting ______ for about ten minutes.
— I'm sorry. The traffic is heavy.
A. has begun
B. began
C. has been on
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问答题 简答题
什么是活性吸附?
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