临床医生进行社区诊断时最常使用的流行病学调查方法是()
A.暴发调查
B.现况调查
C.个案调查
D.问卷调查
E.典型调查
参考答案:B
Some small chemical plants in Industrial Park will be closed down within half a year according to a
decision _______ yesterday.[ ]
A. making
B. made
C. to be made
D. to make
每次吊运前,应把钩头调整到被吊物件重心的铅垂线上。()
A、正确
B、错误