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编写链串s和链串t连接的运算算法。设链串的类型为LinkString，其有三个域：char data;int length;LinkString*next;

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丸剂中如有金石类药物而难以消化吸收者，可用何药糊丸以助消化（）

A. 麦芽
B. 谷芽
C. 莱菔子
D. 神曲

What cannot be considered as a benefit of vaccination?

A. More flu cases could be prevented.
B. More people are prevented from hospitalization.
C. More people are administered X-rays.
D. Less people got sick because of flu.

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Which of the following is true according to Frieden?

As flu season last year was not severe, more people were prevented from hospitalization.
B. Flu season last year was relatively severe, so morepeople were hospitalized.
C. Flu season last year was relatively severe, so more flu cases were prevented.
D. Flu season last year was relatively severe, so more people get sick.

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胸外心脏按压频率为（)

A. 20～40次/分
B. 40～60次/分
C. 60～80次/分
D. 80～100次/分
E. 100～120次/分

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