题目内容

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

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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

()playaveryimportantpartinhydraulicsystemsbypreventinginteractionbetweendifferentpartsofthehydrauliccircuit.

A. Motors
B. Checkvalves
C. Safetyvalves
D. Reducingvalve

Aclaimforcargodamagesmaybeheldagainsttheshipownerifsuchdamageistheresultoffailureoftheship’sofficersto().

A. ensurethefitnessandsafetyofcargospaces
B. ensureadequatepackagingofthecargo
C. preventdelaysduetoquarantinerestrictions
D. correctalldefectsintheship'sconstruction

()istheproductionofpurewaterfromseawaterbyevaporationandre-condensing.

A. Evaporation
B. Circulation
Condensation
Distillation

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