单项选择题
The type of gauge most commonly used to measure pressure is the （）.
A.bimetallic type B.diaphragm type C.bourdon tube type D.resistance-temperature type
单项选择题 When refrigerant leaves the receiver, it flows next on to the （）.
单项选择题 A compound gauge is typically installed on the （）.
单项选择题 Which of the listed statements is correct concerning the starting of centrifugal pumps?（）
