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【多选题】
流行病学的观察性研究方法一般包括()oA.
横断面研究（√）
B.
比例死亡比研究（√）
C.
生态学研究（√）
D.
病例对照研究（√）
E.
队列研究（√）
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举一反三
【简答题】船舶同步发电机并联运行合闸时,频率差不应超过额定频率的______。
【单选题】蛋白质溶液的稳定因素是
A.
蛋白质溶液的黏度大
B.
蛋白质在溶液中有布朗运动
C.
蛋白质分子表面带有水化膜和同种电荷
D.
蛋白质溶液有分子扩散现象
E.
蛋白质分子带有电荷
【单选题】In the sentence \"Maybe he doesn\'t see it himself\" in the second paragr
A.
In the sentence /"Maybe he doesn/'t see it himself/" in the second paragraph, the pronoun/"it/" refers to__________ A．being friendly
B.
a bit of envy
C.
lucky dog
D.
your luck
【单选题】According to the passage, an adherent of the 'nominalist school' cited in the third paragraph would classify a rare new fever in which of the following ways?
A.
She would establish what cures the fever, then compare the treatment with other successful treatments to classify the disease.
B.
She would wait until the disease appears in other patients, then classify it by establishing variations in their symptoms.
C.
She would determine whether the disease is acquired or genetic, then classify it accordingly.
D.
She would isolate the bacteria or virus or genetic anomaly which causes the disease, then classify it accordingly.
E.
She would describe the patient's symptoms, compare them to patients who have had similar symptoms, then treat the pattern as a disease.
【简答题】Mr.Smith asked his secretary to ______a new paragraph in the annual report she was typing. A)inject B)install C)invade D)insert
【简答题】The specific economic behaviour that is mentioned in the first sentence of Paragraph 2 might be __（ ）
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