单项选择题
A.moisturizing B.dehumidification C.dampening D.humidification
A reciprocating air compressor is running roughly and v...
单项选择题A reciprocating air compressor is running roughly and vibrating excessively, indicating that the （）.
A.compressor is overloaded B.motor is overloaded C.foundation bolts are loose D.belts are too tight
The term "pour point" is defined as the lowest temperat...
单项选择题The term "pour point" is defined as the lowest temperature at which lubricating oils will flow （）.
A.rapidly B.by gravity C.through a standard orifice at a specified temperature D.at a rate of 60cc per second
When liquid reaches the compressor of a refrigeration s...
单项选择题When liquid reaches the compressor of a refrigeration system through the suction line, the condition is called （）.
A.flooding back B.superheating C.overflowing D.recycling
