晶闸管由导通变为截止的条件是()。
A、控制电压减小
B、控制电压反相
C、阳极、阴极电压为零
参考答案:C
— Is there any particular soup you would like to have?
— _____ you select is all right with me.
[ ]
A. Whatever
B. Anything
C. No matter what
D. Whichever
关于手外伤清创术的处理原则,下列哪项不恰当
A.力争在6~8h内进行
B.最好在气囊止血带下进行
C.创口方向纵行越过关节或与指蹼边缘平行时,应采用“Z”字成形术
D.不能在有张力的情况下,勉强缝合伤口
E.软组织缺损较大有骨外露时,最好用游离植皮术