单项选择题
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
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 （）.
单项选择题 A re-heater in an air conditioning system functions to （）.
单项选择题 If one of the bilge system manifold valves does not properly seat, the （）