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【简答题】
肝胰壶腹( Vater 壶腹)
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举一反三
【单选题】Pressure switch controls ( )
A.
electrical circuit
B.
flow direction
C.
fluid pressure
D.
oil flowrate
【单选题】以下不能作为乳化剂的是
A.
高分子溶液
B.
表面活性剂
C.
电解质
D.
固体粉末
【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】真空断路器的操动机构的型式是( )。
A.
液压式
B.
弹簧储能式
C.
电磁式
D.
手动式
【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】在有瓦斯区域进行爆破作业,爆破网路的连线方式只准采用 ()
A.
串联
B.
并联
C.
串并联
D.
并串联
【单选题】以下不能作为乳化剂的是
A.
高分子溶液
B.
表面活性剂
C.
电解质
D.
固体粉末
E.
凝胶
【多选题】以下关于网络广告的计费方式说法正确的有
A.
展示计费
B.
行动计费
C.
销售计费
D.
以上说法均不正确
【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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