爆破效果主要取决于先进的爆破方法,与岩石性质无关。
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What is the operating principal of a flash type evaporator?()
A. Sea water is heated to boiling temperature under a vacuum
B. Sea water is passed over heated plates in a thin film
C. Heated sea water is injected into a vacuum chamber
D. Sea water is forced through a heated eductor
不应在单位不能控制的电气设备或线路上工作或装设临时接地线。
A. 正确
B. 错误
党的思想路线是一切从实际出发,()在实践中检验真理和发展真理。
A. 理论联系实际,实事求是
B. 开拓创新,与时俱进
C. 解放思想,实事求是
D. 实事求是
220kV及以上变电工程作业人员上下时构架时必须使用何种安全防护用品?