单选题音频信号为400HZ与500HZ,调制fc时,可能产生的三阶互调失真频率为()A300HZ,600HZBfc+300HZ,fc+600HZCfc+1200HZDfc+100HZ,fc+900HZ
单选题
音频信号为400HZ与500HZ,调制fc时,可能产生的三阶互调失真频率为()
A
300HZ,600HZ
B
fc+300HZ,fc+600HZ
C
fc+1200HZ
D
fc+100HZ,fc+900HZ
参考解析
解析:
暂无解析
相关考题:
单选题It is possible,and sometimes necessary,to strengthen the deck of a vessel for carriage of deck cargo by().Aplacing bunker on the deckBbuilding a stage on which to place the cargoCwelding steel feet to the deck,on which the cargo is placedDerecting vertical pillars under the deck to support the cargo
单选题Two mooring lines may be placed on the same bollard and either one cast off first if().Athe eye of the second line is dippedBthe mooring lines are doubledCthe bollard has two hornsDone of the lines is a breast line
单选题船员营运期间的自修是船舶常规的预防检修,其工作计划制定的依据是()。 a.船舶检验的周期; b.设备说明书的规定; c.PMS周期; d.附加检验。Aa+bBa+b+cCa+dD仅仅是b
单选题What’s the advantage of oily water separator that meets the requirement of MEPC 60(33) over MEPC 107(49)?()Amore economicBlarger capacity on oil treatmentCless costiveDmore capable of separating emulsified oil
单选题If the capacity of the refrigeration compressor is too large, the saturation temperature will ().AriseBfallCbe maintained constantDNone of the above
单选题How should the number 4 be pronounced when spoken on the radiotelephone?().AQUAD-ROS-FOORBNUM-ERL-FOURCNUMB-ER-FOWERDKAR-TAY-FOWER
单选题A diesel engine burns () a gasoline engine of the same capacity in the same period of time.Aas much fuel asBless fuel thanCless fuel asDmore fuel than
单选题根据世界四大柴油机制造商的统计资料,按导致主机故障原因分类,发生故障比例由大到小排列是()。A材料问题、自然磨损、污损、操作问题B污损、材料问题、自然磨损、操作问题C材料问题、污损、操作问题、自然磨损D自然磨损、材料问题、污损、操作问题
单选题When the opening pressure of a diesel fuel injector is greater than that specified by the engine manufacturer,the ()Aquantity of fuel injected is decreasedBquantity of fuel injected will always be increasedCstart of injection is advancedDduration of injection will always be greater
单选题下列哪种情形用人单位可以提前30日以书面形式通知劳动者解除劳动合同()。 Ⅰ、严重违反劳动纪律或用人单位规章制度的; Ⅱ、劳动者不能胜任工作,经培训或调整岗位后仍不能胜任的; Ⅲ、客观情况发生重大变化使原合同无法履行,又不能达成变更合同协议的; Ⅳ、被依法追究刑事责任的; Ⅴ、患职业病因公负伤并被确认丧失或部分丧失劳动能力的; Ⅵ、用人单位未按照劳动合同约定支付劳动报酬。AⅠ+Ⅱ+Ⅲ+Ⅳ+Ⅴ+ⅥBⅡ+Ⅲ+Ⅳ+ⅤCⅡ+Ⅲ+ⅤDⅡ+Ⅲ
单选题锋面具有的主要特征是()。 Ⅰ.锋区中垂直温度梯度小; Ⅱ.锋区中水平温度梯度大; Ⅲ.锋两侧气流呈反气旋性切变; Ⅳ.锋两侧气压梯度不连续; Ⅴ.锋两侧气流呈气旋性切变; Ⅵ.锋面向冷区倾斜。AⅠ~Ⅳ,ⅥBⅠ,Ⅱ,Ⅳ~ⅥCⅡ~ⅥDⅡ,Ⅳ~Ⅵ
单选题INMARSAT-B SES与航行在印度洋上的IMN为341210810的SES通电话,正确的拨号是()A0086341210810#B00412341210810#C00872341210810#D00873341210810#
单选题对于VISCOCHIEF型燃油黏度控制系统,当处在手动操作状态时,黏度控制器面板上右侧三位数码显示器显示的内容是()。A蒸汽调节阀阀门开度B黏度设定值C黏度实际值D操作模式指示