单项选择题

下列哪项不属于标本采集的原则
A、根据检验目的选择容器
B、培养标本须放在无菌容器内
C、应在空腹时进行
D、停用干扰检查结果的药

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多项选择题

Suppose your brother is going to take an exam, what could you say to him?
A. Best wishes for your exams. B. Hope you do well in your exams. C. Good luck with your exams etc. D. Sorry for your exams.

单项选择题

（）存储技术的主要缺点是误码率比较高

A.缩微
B.声像
C.光盘
D.计算机