题目内容

Duringanyoperationinhydraulicsystem,oilprefersthepathof

A. maximumresistance
B. leastresistance
C. bothA.andB.
D. noneoftheabove

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Pressuredropinpipesdueto

A. load
B. friction
C. bothoftheabove
D. noneoftheabove

Highviscosityfluidshave

A. lowpressuredrop
B. lesspowerconsumption
C. slowoperation
D. alloftheabove

Whatcausespressuredropinhydraulicsystems?

A. longlengthofpipe
B. friction
C. typeoffluid
D. alloftheabove

Inapipe,flowrateis3000mL/minandflowvelocityis5cm/s.Thecross-sectionareaofthepipeis:

A. 5cm2
B. 10cm2
C. 15cm2
D. 20cm2