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【单选题】
反映某地区某一时点或期间疾病分布的特点以及人们的某些特征与疾病之间的联系，不设严格的对照，使用的指标主要是患病率，该研究为A.
现况研究
B.
病例对照研究
C.
队列研究
D.
流行病学实验研究
E.
分析性研究
拍照语音搜题，微信中搜索"皮皮学"使用
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皮皮学刷刷变学霸
举一反三
【简答题】Wild winds were sweeping through the area at extreme _____,destroying houses and erasing any landmark in their way.
【单选题】关于回火索氏体和索氏体的比较错误的是（ ）。
A.
回火索氏体的强度、塑性和韧性均好于索氏体
B.
回火索氏体中的渗碳体为片状，而索氏体中的渗碳体为粒状
C.
回火索氏体是调质处理的结果
D.
索氏体是正火处理的结果
【简答题】索氏体的符号为 [填空(1)]A. S
【简答题】The rules were s______ designed to protect wild animals.
【单选题】Wild winds were sweeping through the area at extreme _______, destroying houses and erasing any landmark in their way.
A.
velocity
B.
superiority
C.
curiosity
D.
ambiguity
【单选题】Between 1638 and 1650 hours this day，strong gusty winds were ______ by my vessel，in consequence of which，the vessel's four mooring lines were broken and her portside gangway severely damaged．
A.
gone
B.
done
C.
had
D.
experienced
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