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问题 单项选择题

属于我国生产及使用的麻醉药品品种的是

A．二氢埃托啡

B．哌醋甲酯

C．咖啡因

D．海洛因

E．丁丙诺啡

答案

参考答案：A

解析：哌醋甲酯、咖啡因、丁丙诺啡为精神药品，我国不生产使用海洛因。

单项选择题

When Henry arrived home after a hard day at work, his wife was slept.

A．his wife was sleeping

B．his wife slept

C．his wife has slept

D．his wife has been sleeping
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单项选择题

为使日期型数据库能够显示世纪(即年为4位)，应该使用命令( )。

A．SET MARK ON

B．SET DATE ON

C．SET CENTURY ON

D．SET STRICTDATE ON
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