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问题
判断题
排土是白云铁矿生产工艺的一个环节。
答案
参考答案：
对
选择题
The examination will begin at 10:30. Those who come late _____ to the examination room.
A. have not been admitted
B. don't admit
C. will not be admitted
D. didn't admit
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判断题
氩弧焊所产生的紫外线强度是焊条电弧焊的5~30倍。
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