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【判断题】
基尔霍夫电压定律( KVL )说明在集总参数电路中,在任一时刻,沿任一回路巡行一,各元件的 电压 代数和为零。A.
正确
B.
错误
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举一反三
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【单选题】传递B细胞第一活化信号的信号转导分子为( )
A.
CD79a和CD79b
B.
CD19和CD21
C.
CD3和CD4
D.
CD4和CD8
E.
CD40和CD40L
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