皮皮学，免费搜题
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【多选题】
专项旅游有( )等形式A.
宗教旅游
B.
购物旅游
C.
会展旅游
D.
学术考察
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皮皮学刷刷变学霸
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【简答题】What can be used to handle an oil spill?
【简答题】Crude oil must be and then can be used.
【单选题】Which of the listed conditions can be used to determine if lube oil has been diluted by fuel? .
A.
Viscosity is decreased
B.
Octane number is altered
C.
Pump speed is decreased
D.
Blower’s speed is decreased
【单选题】Satellite tracking and remote communication systems can be used to
A.
reduce oil consumption.
B.
remove the obstacles on the road.
C.
call for help when one's car crashes.
D.
help drivers get out of a traffic jam.
【单选题】A lube oil filter can be used to remove most contaminants from lube oil. A contaminant which will remain in the lube oil after filtering is ____.
A.
acid
B.
fuel oil
C.
sediment
D.
water
【单选题】____ can be used to prevent hydraulic system overloaded or keep the pressure of oil outlet from pump constant
A.
Overflow valve
B.
Reducing valve
C.
Balancing valve
D.
Reducing valve or balancing valve
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