单项选择题

When the propeller blades are integral with the hub, the propeller is called a （）.

A.built up propeller
B.solid propeller
C.controllable pitch propeller
D.suction back propeller

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单项选择题

The tendency of a flammable liquid to vaporize is indicated by its （）.

A.ignition temperature
B.flash point
C.flammable range
D.convection index

单项选择题

Moisture in the refrigerant may （）.

A.freeze on the expansion valve seat and reduce the flow of liquid refrigerant
B.emulsify the oil in the condenser
C.freeze in the king valve
D.clog the oil trap

单项选择题

Why will a two stage flash type distilling plant tend to operate more efficiently when operating in cold seawater?（）

A.The colder seawater passing through the condenser tube bundles of the various stages increases evaporator vacuum
B.The amount of heated feed water discharged from the feed water heater after cndenser is increased
C.Fewer non-condensable gases are created by the flow of colder seawater
D.More seawater is allowed to pass through the flint stage overflow weir