【单选题】The refrigeration system low pressure cutout switch is actuated by______.
A.
an electric system manager
B.
a sensing bulb at the tail coil of the evaporator
C.
pressure changes in the suction line
D.
failure of the king solenoid valve
【单选题】电子商务是一种风上交易方式,所有的网上交易都是有两个环节组成的,一是交易环节,二是()。
【单选题】The purpose of the refrigeration system low pressure cutout switch is to ()
A.
protect the compressor from liquid flood back
B.
protect the compressor from low discharge pressure
C.
start and stop the compressor upon system demand
D.
start the compressor after a drop in the evaporator pressure
【单选题】The sensing line for the low pressure cutout switch to a refrigeration system is located ______.
C.
on the suction side of the compressor
D.
on the discharge side of the compressor
【多选题】ZZK-12型中置式开关柜配VSl型真空断路器,断路器合闸操作后,合闸弹簧不能贮能,可能的原因是()故障