单项选择题
The maximum pressure developed by a waste heat boiler is determined by the main engine exhaust （）.
A.gas composition B.gas temperature C.pressure D.timing
单项选择题 Camshafts are usually driven by timing gears or （）.
单项选择题 A waste heat boiler is installed on some diesel propelled vessels to （）.
单项选择题 What is the speed of the crankshaft in a four-stroke/cycle engine when the camshaft is turning at 750 rpm?（）
