导致手术野污染的因素，应除外
A．手术器械
B．麻醉器械
C．手术人员的手臂
D．感染病灶或腹内空腔脏器
E．患者手术区皮肤
参考答案：B
方程x2-2x=0的解是（ ）
A．x=2
B．x=0
C．x1=0，x2=-2
D．x1=0，x2=2
．As the proverb goes, “Where there is a will, there is a way．” You can _______ more than you believe possible if you really set your mind on it．
A．assess
B．accumulate
C．accomplish
D．approve
