A.safety valve
B.blow down valve
C.scum valve
D.feed check valve
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A.descriptions
B.discrepancies
C.different
D.deflections
A.completed
B.carried out
C.cleaned
D.steamed
A.one to supply steam to the main propulsion turbine
B.an auxiliary boiler
C.A and B
D.neither A nor B
A.fuel tank
B.bilge
C.atmosphere
D.auxiliary exhaust line
A.ensure feed water flow into the boiler
B.keep the steam drum pressure high
C.prevent water hammer in the feed line
D.help the feed water flash to steam
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The rate of heat transfer from a hot region to a cold region is affected most by the （）.
If the thermal bulb of an expansion valve is incorrectly placed at the center of the coil instead of the end, it will （）.
A pressure drop through the refrigerant liquid line may cause （）.
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Low compressor head pressure in a refrigeration system can be caused by（）.
Which of the problems listed would came the discharge temperature of an R-12 refrigeration compressor to increase?（）
An increasing head pressure in a refrigeration system, without any corresponding change in the cooling water inlet temperature, would probably be caused by （）.
The rate of heat transfer between the hot and cold fluids passing through a shell-and-tube type heat exchanger will （）.
Heavy wear in a particular area of the inner circumference of a packing ring may be caused by （）.
A salinity indicator is used to determine the （）.