单项选择题
（）is used in typical marine pattern self-contained unit.
A.a water cooled condenser B.a slop tank C.a expansion tank D.a centrifugal pump
单项选择题 Which one is not the component of a typical, marine pattern self-contained unit?（）
单项选择题 With ducted air conditioning systems, the modern tendency is to use（）
单项选择题 The（） only allows for adjustment of temperature in each room by the occupant manually controlling the air volume admitted.
