题目内容

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

查看答案

搜索结果不匹配？点我反馈

更多问题

（）playaveryimportantpartinhydraulicsystemsbypreventinginteractionbetweendifferentpartsofthehydrauliccircuit.

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

查看答案

Aclaimforcargodamagesmaybeheldagainsttheshipownerifsuchdamageistheresultoffailureoftheship’sofficersto（）.

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

查看答案

（）istheproductionofpurewaterfromseawaterbyevaporationandre-condensing.

A. Evaporation
B. Circulation
Condensation
Distillation

查看答案

Whenavacuumboilingevaporatorworks,thehotjacketwaterwillpassoverthetubestackand（）theseawaterpassingthroughthetubes.

A. dispose
B. dissolve
C. heat
D. dissipates

查看答案

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.

Aclaimforcargodamagesmaybeheldagainsttheshipownerifsuchdamageistheresultoffailureoftheship’sofficersto（）.

（）istheproductionofpurewaterfromseawaterbyevaporationandre-condensing.

Whenavacuumboilingevaporatorworks,thehotjacketwaterwillpassoverthetubestackand（）theseawaterpassingthroughthetubes.

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