题目内容

Amongthebasiccategoriesofequipment,whichofthefollowingareusedtoconvertthehydraulicenergyintolinearmotion?()

A. Hydraulicpumps
B. Valves
C. Hydrauliccylinders
D. Hydraulicmotors

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ThesingleactingcylinderisthesimplestformwherepressureisappliedtothefullareaofthepistonheadtomovetheloadthroughpistonrodextensionTheloadcausesrod()whenthedrivepressureisreleased.

A. contraction
B. retraction
C. expansion
D. shrinkage

A“wetcargo”refersto().

A. acargothatwillbedamagedifitgetswet
B. bulkliquids
C. cargoesthatwillcausecondensation
D. liquidsincontainers

从子过程退出,并返回到主调过程,可使用语句()

A. Return
B. ExitSub
C. Exit
D. StopSub

若调制信号的频率是从300HZ~3000HZ,那么普通调幅电路中带通滤波器的通频带宽度至少应为()。

A. 3000HZ
B. 5400HZ
C. 600HZ
D. 6000HZ

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