MLS3-170采煤机的电气保护回路不设有电机温度保护。()
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Excessive oil foaming in the crankcase of a refrigeration compressor is most likely to occur() when the compressor.
A. has continuously for a long period
B. suction pressure is below normal
C. oil level is below normal
D. starts after a long idle period
目前公积金贷款利率是多少?和商业贷款相比有什么优势?
润滑油或者机油对食品的污染同样属于多环芳烃类的污染。
A. 正确
B. 错误
对于转速较高的凸轮机构,为了减小冲击和振动,从动件运动规律最好采用()运动规律。
A. 等速;
B. 等加速等减速;
C. 正弦加速度