任何一个有源两端线性网络都可用一个等效的电压源表示。
参考答案:对
― What does your mother do after dinner, Ellen?
—She always a walk. Look! She a walk with my father now.
A.take; is taking
B.is taking; take
C.takes; is taking
D.is taking; takes
饥不欲食,舌质光红与下列哪项并见,对诊断胃阴虚证最有意义()
A.口泛清水
B.呕吐酸腐
C.干呕呃逆
D.呕吐鲜血
E.泛恶吞酸