单项选择题
A.clarifier B.oil/water separator C.incinerator D.distiller
Which is the pollution prevention equipment?（）A.booster...
单项选择题Which is the pollution prevention equipment?（）
A.booster pump B.evaporator C.incinerator D.cooler
Sludge may form in the lubricating oil crankcase of a r...
单项选择题Sludge may form in the lubricating oil crankcase of a reciprocating air conditioning compressor as a result of （）.
A.wax precipitation in the lube oil B.contamination by dust, scale, or moisture C.refrigerant bubbles in the lube oil D.refrigerant reducing the lube oil viscosity
In a chilled water air conditioning unit using a recipr...
单项选择题In a chilled water air conditioning unit using a reciprocating compressor, the refrigerating effect of the primary refrigerant can be increased by （）.
A.increasing refrigerant pressure in the coil B.increasing chilled water flow through the cooler C.sub-cooling the refrigerant in the condenser D.superheating the refrigerant in the compressor
