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问题
单项选择题
下列加工方法中,能加工孔内环形槽的是()。
A.钻孔
B.扩孔
C.铰孔
D.镗孔
答案
参考答案:D
选择题
The reason _____ she gave for not coming was _____ the heavy snow prevented her coming.
A. why; because
B. why; whether
C. that; that
D. how; that
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名词解释
时效关系
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