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问题 单项选择题

哪组药控制稳定型心绞痛效果最好（）

A.维拉帕米+硝苯地平

B.美托洛尔+硝酸异山梨酯

C.双嘧达莫+硝酸异山梨酯

D.巯甲丙脯酸+硝酸异山梨酯

E.地尔硫+阿司匹林

答案

参考答案：B

单项选择题

协助对本辖区病人、疑似病人和突发公共卫生事件开展调查，收集和提供病人、密切接触者、其他健康危害暴露人员的相关信息。（）

A.是现场调查

B.是流行病学调查

C.是回顾性调查

D.随访调查
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单项选择题

The major problem with E-mail is that it is (71) easy to use that people can become (72) with messages (73) they can possibly answer in a day. In addition, mail boxes require some management to (74) messages or archive those that might be required later. Senders don’t always know about your E-mail backlog and often send (75) messages.

A．manage

B．save

C．backup

D．dispose of
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