题目内容

谐振功率放大器的集电极直流馈电电路的串馈,是指()在电路形式上串联。

A. 直流电源V
B. 集电极电感
C. 负载LC谐振回路
D. 功率管C、E极

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AvesselisfoundtobeseaworthyafteracomplaintinwritingtotheAmericanConsulbytheChiefandSecondMates.Thecostofthesurveyistobepaidbythe().

AmericanConsul
B. ChiefandSecondMates
C. Vessel'sagent
D. vessel'sowners

煤热解形成半焦后继续加热,在700℃附近,一面发生收缩,一面产生以()为主的煤气。

A. H
B. CO
CH
D. CH

丁类谐振功率放大器的效率最高,主要是因为()。

A. 工作状态为丙类
B. 开关工作状态,集电极损耗功率P很小
C. 采用了将输入信号变为两个极性相反的推动电压的变压器

AtleastonereinspectionshallbemadeoneachvesselholdingaCertificateofInspectionvalidfortwoyears.Thisinspectionshallbeheldbetweenthetenthandfourteenthmonthsofthedurationperiodofthecertificateandshallbe().

A. atthediscretionoftheinspector,butinnogreaterdetailthanrequiredfororiginalcertification
B. atthediscretionoftheinspector,butinnolesserdetailthanrequiredfororiginalcertification
C. generallysimilarinscopetotheinspectionrequiredforcertification,butinlessdetail
D. equivalenttotheinspectionrequiredforcertification

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