单项选择题
A viscosity regulator used for an engine is usually provided in order to （） for an engine burning heavy fuel oil.
A.regulate the fuel supply
B.maintain a constant fuel viscosity at the fuel valves
C.maintain efficient cooling
D.alter the fuel density
点击查看答案&解析
相关考题
-
单项选择题
A manometer is used to measure （）.
A.pressure
B.temperature
C.volume
D.specific gravity -
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 -
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
