题目内容

Moistureabsorbedinthewindingsorcondensedonthesurfaceofelectricalmachineryinsulation（）

A. isgoodforlongtermpreservingsincemostinsulationisorganicandcontainssomeamount
B. lowerstheinsulationvalueandisacommoncauseoffaultgroundsinidlemachines
C. willenhanceinsulationresistanceonlyifitisfreshwaterandcontainsnosalt
D. reducestheamountofcurrentsuppliedordrawnbythemachinesohorsepowerislimited

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TheSafetyRadioCertificateforthecargoShipisissued（）.

A. bytheRadiotelegraphyAuthorityofacountry
B. inaccordancewiththeGovernmentRegulations
C. byComplyingwiththeProvisionsoftheinternationalConventions
D. undertheProvisionsoftheSOLASConvention

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为比较蔬菜中维生素C含量，黎明同学根据维生素C可使高锰酸钾溶液褪色的原理，设计了如下实验：在四只同样的试管中分别加入2毫升相同浓度的高锰酸钾溶液，然后用滴管分别向其中滴加黄瓜、青椒、芹菜、白菜的汁液，边滴边震荡，直到高锰酸钾溶液褪色为止，实验结果如下：据表可知维生素C含量最多的蔬菜是（）

A. 黄瓜
B. 青椒
C. 芹菜
D. 白菜

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TodeterminethenumberofAbleSeamenrequiredonamobileoffshoredrillingunit，youshouldcheckthe（）.

A. loadlinecertificate
B. OperationsManual
C. SafetyofLifeatSeaCertificate
D. CertificateofInspection

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YouareattemptingtoparalleltwoACgenerators,andthesyncopepointerisrevolvinginthefastdirectionThisindicatesthatthefrequencyoftheincomingmachineis（）.

A. higherthanthebusfrequency
B. lowerthanthebusfrequency
C. thesameasthebusfrequencybutoutofphasewithit
D. thesameasthebusfrequencyandthecircuitbreakermaybeclosedatanypointerposition

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