单项选择题
A.regulate the fuel supply B.maintain a constant fuel viscosity at the fuel valves C.maintain efficient cooling D.alter the fuel density
A manometer is used to measure （）.A.pressureB.temperatu...
单项选择题A manometer is used to measure （）.
A.pressure B.temperature C.volume D.specific gravity
"gauge pressure" means（）.A."vacuum"B."the excess of pre...
单项选择题"gauge pressure" means（）.
A."vacuum" B."the excess of pressure above atmosphere" C."figure on a gauge" D.Any of the above
The （） is used to measure the volume of a liquid or gas...
单项选择题The （） is used to measure the volume of a liquid or gas through a pipeline within any given period of time.
A.flowmeter B.viscometer C.micrometer D.feeler
