单项选择题
A.Open the bilge pump for inspection
B.Remove each of the manifold valves
C.Remove only the manifold valve to the affected bilge-well
D.Attempt to pump out another bilge well to determine if the entire system is affected
单项选择题 If a liquid sight flow indicator in a refrigeration system shows gas bubbles in motion passing inside of the glass, there is （）.
单项选择题 Dual electro-hydraulic steering units usually operate （）.
单项选择题 One distinct advantage of flash type evaporators, as compared to most other evaporators, is that in a flash evaporator （）.