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【单选题】
下列关于精液说法错误的是A.
正常精液量为2～6ml
B.
正常精液pH为7．0～7．8
C.
室温放置30分钟内液化
D.
精子密度(20～200)×109／L
E.
正常形态精子占50％
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举一反三
【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】If a refrigeration compressor were short cycling on the low pressure cutout switch, the probable cause for this might be the ______.
A.
system was overcharged with refrigerant
B.
high pressure switch was improperly adjusted
C.
expansion valve strainers were fouled
D.
suction valves were leaking slightly
【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
【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
A.
储能电气回路
B.
电动机
C.
硅整流器或者微动开关
D.
机构的合闸传动和保持部分
【单选题】If the compressor runs continually, the cause might be the .
A.
high-pressure cutout switch is jammed open
B.
low-pressure switch is jammed shut
C.
thermal bulb is not operating properly
D.
scale trap is clogged
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