黄自元《大字间架结构九十二法》中对鹅钩的运用有"伸勾贵抱持"的说法，请网上查阅并简要表述这说法的含义。
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电感元件的电感值与所通电流成反比。( )
A. 对
B. 错
电感元件中的电流i越大,则其两端的电压v就越大;若i=0,则v=0。( )
A. 对
B. 错
Which of the following molecules are involved in the formation of B cell coreceptor?
A. CD19
B. CD20
CD21
D. CD22
E. CD81
Which of the following pairs of molecules provides the most important second signal for B cell activation?
A. CD28 on T cells and B7 on B cells
B. CD28 on B cells and B7 on T cells
CD40 on B cells and CD40L on T cells
D. CD40 on T cells and CD40L on B cells
E. LFA-1 on B cells and ICAM-1 on T cells
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