小儿烧伤后败血症多发生于()
A.12~24小时
B.24小时
C.48小时
D.1~2周
E.2~3周
参考答案:C, E
All the doctors in the hospital insisted that he ____ badly wounded and that he ____ at once.
A.should be; be operated on
B.were; must be operated on
C.was; should be operated
D.was; be operated on
用直径为25mm高速钢麻花钻钻孔,选用切削速度为30m/min,求工件转速