97免费在线观看视频,亚洲综合自拍网,黄色毛片免费观看,热久久综合网,免费看日产一区二区三区狠狠操av,久久久涩涩涩,在线精品免费视频,人人插天天干,久久91精品国产91久久

<optgroup id="sms6j"></optgroup>

<strong id="sms6j"><address id="sms6j"><pre id="sms6j"></pre></address></strong>

單項(xiàng)選擇題

（）is a fast and powerful operating system， based on the UNIX O.S.

A. Windows 2012
B. Office 2016
C. Windows 10
D. Linux

你可能感興趣的試題

單項(xiàng)選擇題

（）is used to communicate with another computer over telephone lines.

A. keyboard
B. modem
C. mouse
D. printer

單項(xiàng)選擇題

The OSI model has （）layers.

A. four
B. five
C. six
D. seven