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问题
判断题
掣轮式手制动机组装时，各转动部位须注油。
答案
参考答案：错
选择题
With its rapid growth in population, the city _____ in all directions in the last five years.
A. spreads
B. had spread
C. spread
D. has spread
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问答题 简答题
试述国内外深凹露天矿强化自然通风的方法？
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