单项选择题

引经药用量不适合太小，防止药不达病所

A．对
B．错

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When a steady current flows through the interface of two different conductive media, the surface density of electric charge at the interface of two different conductive media must be σ = 0 when the permittivity and conductivity of the two conductive media satisfy _______. (The permittivity and conductivity of two different conductive media are ε1, γ1 and ε2, γ2, respectively)
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PLC输入端口是否工作，与外部输入信号无关，由PLC程序决定。
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