Which of the following type of lamp is used for heating a fuser？（） A: Xenon B: Halogen C: Incandescent D: Light Emitting Diode

Linux系统中，以下哪些命令可以查看一个文件是否有进程在使用？（） A: file B: lsof C: fuser D: stat

http://image.zhihuishu.com/download/upload/uccmanage/eweb/user/20150720105039754.jpg" _ewebeditor_pa_src="http%3A%2F%2Fimage.zhihuishu.com%2Fdownload%2Fupload%2Fuccmanage%2Feweb%2Fuser%2F20150720105039754.jpg" border="0

（视频5.2.6测试题）http://image.zhihuishu.com/download/upload/uccmanage/eweb/user/20150724091753721.png" _ewebeditor_pa_src="http%3A%2F%2Fimage.zhihuishu.com%2Fdownload%2Fupload%2Fuccmanage%2Feweb%2Fuser%2F20150724091753721.png" border="0

（视频5.1.1测试题）http://image.zhihuishu.com/download/upload/uccmanage/eweb/user/20150721193004260.png" _ewebeditor_pa_src="http%3A%2F%2Fimage.zhihuishu.com%2Fdownload%2Fupload%2Fuccmanage%2Feweb%2Fuser%2F20150721193004260.png" border="0

（视频5.1.2测试题）http://image.zhihuishu.com/download/upload/uccmanage/eweb/user/20150721193146521.png" _ewebeditor_pa_src="http%3A%2F%2Fimage.zhihuishu.com%2Fdownload%2Fupload%2Fuccmanage%2Feweb%2Fuser%2F20150721193146521.png" border="0

（视频5.2.2测试题）http://image.zhihuishu.com/download/upload/uccmanage/eweb/user/20150724085211539.png" _ewebeditor_pa_src="http%3A%2F%2Fimage.zhihuishu.com%2Fdownload%2Fupload%2Fuccmanage%2Feweb%2Fuser%2F20150724085211539.png" border="0

（视频5.2.3测试题）http://image.zhihuishu.com/download/upload/uccmanage/eweb/user/20150724085653538.png" _ewebeditor_pa_src="http%3A%2F%2Fimage.zhihuishu.com%2Fdownload%2Fupload%2Fuccmanage%2Feweb%2Fuser%2F20150724085653538.png" border="0

（视频5.1.1测试题）<img width="142" height="47" src="http://image.zhihuishu.com/download/upload/uccmanage/eweb/user/20150721192817180.png" border="0" _ewebeditor_pa_src="http%3A%2F%2Fimage.zhihuishu.com%2Fdownload%2Fupload%2Fuccmanage%2Feweb%2Fuser%2F20150721192817180.png

A system administrator is attempting to unmount filesystem /dev/data and receives the following message：   umount： 0506-349 Cannot unmount /dev/data： The requested resource is busy.   Which of the following commands can be used to determine which process has open references within the filesystem？（） A: lsfs B: topas C: fuser D: mount