题目内容

Whatisthepurposeofareliefvalve?()

A. tofill2tanksatthesametime
B. tousepumpatahigherpressure
C. toreturnliquidtosuctionsideifdischargevalveisclosed
D. Alloftheabovearetrue

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单谐振回路谐振放大器的短形系数K0.1等于()。

A. 2.35
B. 3.15
C. 10

Whichofthefollowingpumpsbelongstocentrifugalpump?()

A. Pistonpump
B. Screwpump
C. Diffuserpump
D. Water-ringpump

在同步调谐的多级单调谐回路放大器中,当级数增加时,放大器的选择性()。

A. 变坏
B. 变好
C. 增宽
D. 变窄

ThecertificateofaLloyd’ssurveyor()likelytobeacceptedbythecourtasconclusivetoshowthatthecarrierhasexercisedduediligencewhenitrelatestoacaseinwhichhehasbuiltorboughtavesselinthefirstinstance.

A. are
B. is
C. have
D. has

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