题目内容

Which of the following are not handheld computers?

A. Enhanced media players
B. Desktop computers
C. Smartphones
D. Tablets

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Without ( ) in the system unit of computer, the monitor can’t display images.

A. sound card
B. network card
C. keyboard
D. graphics card

Portable computer form factors include () styles and ( )styles.

样品保存的原则是（）。

A. 干燥
B. 低温
C. 避光
D. 密封

样品采样数量为：样品一式三份，分别供（）。

A. 检验
B. 复查
C. 保留被查
D. 分析