单项选择题

Convection is the principal means _____ temperature is equilibrated in liquids and gases.
A.in which
B.on which
C.by which
D.from which

A.
A.in
B.on
C.by
D.from

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单项选择题

在CHP板上“NAVDAT”键，可用来选择显示：

A.GSPTTGET和风参数
B.GSPGBTTTG
C.DISTBRGGSPD
D.ISTTTGET和风参数

单项选择题

Which of the problems listed would came the discharge temperature of an R-12 refrigeration compressor to increase?
A.Thermal expansion valve frozen open
B.Suction gas heat exchanger bypassed
C.Condenser clogged or fouled
D.High pressure cutout switch inoperative

A.Thermal
B.Suction
C.Condenser
D.High