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问题
名词解释
断口
答案
参考答案:
当矿物遭受超过其弹性极限的外力作用,沿任意方向破裂成不平整的断面。
选择题
It was a pity that the great writer died _____ his works unfinished.
A. for
B. with
C. from
D. of
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填空题
判断电流磁场的方向是用()。
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