必须优先抢救的急症有()
A.心脏骤停
B.窒息
C.大出血休克
D.开放性气胸
E.以上全是
参考答案:E
解析:A、B、C、D均为必须优先抢救的急症。
Charles Babbage is generally considered ________ the first computer. [ ]
A. to invent
B. inventing
C. to have invented
D. having invented
食品污染的防治是细菌和霉菌污染的防治。