题目内容

Todeterminethenumberofableseamenrequiredonaninspectedvessel,youshouldcheckthe().

A. LoadLineCertificate
B. operationsmanual
C. SafetyofLifeatSeaCertificate
D. CertificateofInspection

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制动轮加工后表面粗糙度不低于()。

A. 1.5μm
B. 1.6μm
C. 1.7μm
D. 1.8μm

()是一种理想的摩擦状态。

A. 干摩擦
B. 边界摩擦
C. 混合摩擦
D. 流体摩擦

WhentwoACgeneratorsarebeingparalleled,thebreakershouldbeclosedwiththesynchroscopepointermatinginthe()

A. "slow"direction,justbeforethe12o'clockposition
B. "fast"direction,justafterthe12o'clockposition
C. "fast"direction,justbeforethe12o'clockposition
D. "slow"direction,justafterthe12o'clockposition

直流电机中,电刷位于()上。

A. 定子
B. 转子
C. 电枢
D. 外壳

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