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问题
填空题
在含硫油气井,()等气体易聚集的场所,应安装防爆排风扇以驱散工作场所弥漫的有害、可燃气体。
答案
参考答案:钻台上下、振动筛、循环罐
选择题
— You look very tired . _____ at all last night?
— No, not really. I'm tired out now.
A. Do you sleep
B. Were you sleeping
C. Did you sleep
D. Had you slept
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判断题
因为辅助触头往往起某种电气联锁作用,所以也称联锁触头。
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