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【单选题】
两个县的结核病死亡率作比较时，作率的标准化处理可以（）。A.
消除两县总人数不同的影响
B.
消除各年龄组死亡率不同的影响
C.
消除两组人口年龄构成不同的影响
D.
消除两组比较时的抽样误差
E.
消除两组比较时的系统误差
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举一反三
【单选题】Which of the following statements is true?______.
A.
To decrease a receivable, debit the account
B.
To decrease revenue, debit the account
C.
To increase owner's equity, debit the account
D.
To increase an expense account, credit the account
【单选题】A new drug is being developed which can specifically inhibit the ACC-2 isozyme in muscle. This drug could potentially be used for which one of the following purposes?
A.
To accelerate weight loss
B.
To reduce the severity of a myocardial infarction
C.
To enhance high-intensity exercise performance
D.
To increase ketone body synthesis in a patient with hypoglycemia
E.
To increase fatty acid synthesis in muscle
【单选题】Which of the following statements is CORRECT?
A.
The accident occurred on a bridge,
B.
The accident occurred in New Delhi.
C.
There were about 600 casualties.
D.
Victims were rescued immediately.
【简答题】有一换热设备,准备在其外面包以两层保温材料.要达到良好的保温效果,应将导热系数较小的保温包A. 外层 B. 内层 C. 外层或内层
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