题目内容

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

YouareattemptingtoparalleltwoACgenerators,andthesyncopepointerisrevolvinginthefastdirectionThisindicatesthatthefrequencyoftheincomingmachineis().

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

Todeterminethenumberofableseamenrequiredonaninspectedvessel,youshouldcheckthe().

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

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

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