绘图题：画出三相全控桥＋A和＋B硅元件或快熔断开后的输出波形图。
参考答案：
如图E-63所示。
The little boy _______ by us just now. [ ]
A. was taken care
B. took care of
C. was taken care of
按一级动力学消除的药物，其血浆半衰期等于
A．0.693/ke
B．ke/0.693
C．2.303/ke
D．ke/2.303
E．0.301/ke
