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

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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

單項選擇題

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