队列研究是从因到果的研究,故检验病因假说的能力较强。
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1976年德国麻醉医生美茵茨成立急救和灾害医学俱乐部。
A. 对
B. 错
四阶段危机管理4R模型理论是由美国罗伯特.希斯提出的。
A. 对
B. 错
On Saturday afternoon, Mrs Green went to the market, _______ some bananas and visited her coursin.
A. bought
B. buying
C. to buy
D. buy
As awful accident ________, however, occur the other day.
A. does
B. did
C. has to
D. had to
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