单项选择题
A.supplying high pressure oil into a hydraulic motor B.supplying high temperature air into the cylinder C.supplying high pressure air into the cylinder D.electrical igniting
In modern installations, the main engine and the standb...
单项选择题In modern installations, the main engine and the standby auxiliary engines（）
A.can be started at low temperature and are free from preheating B.usually are preheated by steam before being started C.are kept at a constant temperature and free from preheating D.are kept at a low temperature to save energy
In order to maintain a constant outlet water temperatur...
单项选择题In order to maintain a constant outlet water temperature of 80-85℃ from the engine, a three-way valve is installed（）
A.at the jacket cooler outlet to control the flux through the engine B.at the jacket cooler outlet to control the flux through the cooler C.at the engine outlet to control the flux through the engine D.at the engine inlet to control the flux through the engine
About the jacket water, that of the auxiliary engines u...
单项选择题About the jacket water, that of the auxiliary engines usually（） is circulated by pumps, and the main engine usually （）
A.an engine-driven；as well B.an engine-driven；has an independent pump C.an independent；as well D.an independent；has an engine-driven pump
