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單項選擇題

Moisture in a refrigeration system can cause （）.

A.freezing the expansion valve closed
B.corrosion of system piping
C.improper temperature regulation
D.all of the above

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單項選擇題

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

單項選擇題

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

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

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