单项选择题
A.have no plating joints of 90
B.retain the lube oil as long as possible before it recirculates through the system
C.provided drain/return lines that are no greater than 24 inches from the pump suction
D.be provided with only a perfectly horizontal bottom
单项选择题 Main engine room control console alarms are to be of the self monitoring type, meaning that an open circuit to a particular alarm circuit will （）
单项选择题 At which of the following locations would a duplex pressure gage most likely be located?（）
单项选择题 The function of lubricating oil is to （）