Condensate formed within the first-effect tube nest of a double-effect,low pressure evaporator, is removed by a （）.

A.at the compressor discharge
B.at the compressor suction
C.in the expansion valve
D.in the receiver

A.Pressure-reducing valve
B.Unloading valve
C.Counterbalance valve
D.Pressure-relief valve

A.motor overload would open
B.relief valve would open
C.pump would eventually overheat
D.motor would overheat