单项选择题

The movement of heat within a fluid, caused by the application of thermal energy, is called （）.

A.radiation
B.conduction
C.convection
D.condo-radiation

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单项选择题

A gate valve installed in a pipeline should be （）.

A.used in either the fully dosed or fully opened position
B.installed with the stem down
C.used for steam service only
D.used to throttle or regulate the flow of liquid

单项选择题

Which of the following modes of heat transfer does NOT require any physical contact between a warmer and a cooler substance?（）

A.Radiation
B.Conduction
C.Natural convection
D.All of the above

单项选择题

Which of the valves listed should be used either in the fully opened or the fully closed position?（）

A.A gate valve
B.A globe valve
C.Any check valve
D.Any needle valve