题目内容

要定义一个过程为局部过程，应使用（）关键字。

A. Static
B. Public
C. Private
D. Sub

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Amongthebasiccategoriesofequipment,whichofthefollowingisusedtoconverthydraulicenergyintocontinuousrotarymotion?（）

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

Whattypeofvalveisusedtodirecttheflowofhydraulicfluid?（）

A. Reliefvalve
B. Directioncontrolvalve
C. Stopvalve
D. Pressurecontrolvalve

Amongthebasiccategoriesofequipment,whichofthefollowingareusedtoconvertthehydraulicenergyintolinearmotion?（）

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

ThesingleactingcylinderisthesimplestformwherepressureisappliedtothefullareaofthepistonheadtomovetheloadthroughpistonrodextensionTheloadcausesrod（）whenthedrivepressureisreleased.

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