多项选择题
负反馈按采样和求和方式的不同有（ ）等几种类型
A、电压串联负反馈
B、电流串联负反馈
C、电压并联负反馈
D、电流并联负反馈
负反馈按采样和求和方式的不同有（ ）等几种类型
A、电压串联负反馈
B、电流串联负反馈
C、电压并联负反馈
D、电流并联负反馈
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单项选择题
If a person had a mutation in the gene encoding J (joining) chains, which of the following classes of antibodies could NOT be produced? ()
If a person had a mutation in the gene encoding J (joining) chains, which of the following classes of antibodies could NOT be produced? ()
A．IgA
and IgM
B．IgA
and IgG
C．IgG
and IgE
D．IgD
and IgE
E．IgG
and IgM
的值是
