A.fire
B.water wall
C.generating
D.down comer
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A.tightened up
B.sealed up
C.opened up
D.unscrewed
A.use
B.release
C.protect
D.effect
A.paved
B.cleaned
C.welded
D.dismantled
A.water
B.oil
C.heat
D.steam
A.safety valve
B.blow down valve
C.scum valve
D.feed check valve
最新試題
A pressure drop through the refrigerant liquid line may cause （）.
Thermostatic expansion valves can be adjusted for （）.
The amount of fluid friction or internal friction inherent in a mineral lubricating oil is reflected as a measure of its （）.
A salinity indicator is used to determine the （）.
An internal bypass is provided on some hydraulic system suction strainers to help reduce the possibility of （）.
Which of the problems listed would came the discharge temperature of an R-12 refrigeration compressor to increase?（）
Low compressor head pressure in a refrigeration system can be caused by（）.
If the viscosity of the liquid being transferred remains constant as the discharge pressure increases, the rotary pump （）.
An excessive charge of refrigerant in an air-cooled refrigeration system can cause （）.
The rate of heat transfer between the hot and cold fluids passing through a shell-and-tube type heat exchanger will （）.