L-O-R封堵三通的焊接顺序是() ["先焊接环向角焊缝再焊接纵向焊缝","环向角焊缝和纵向焊缝同时焊接","先焊接纵向焊缝再焊接环向角焊缝","先焊纵焊缝再焊环焊缝"]
放映的说法哪个正确() ["对每张幻灯片都可以设置自己的播放时间,也可以全部幻灯片使用相同的播放时间","如果同时选定换片方式的两个选项时,则以早发生的为准","同时清除换页方式的两个选项,则在幻灯片放映时,仅在执行快捷菜单中的“下一页”时换页"]
桑代克后期把练习律看成效果律的附律的原因是() ["练习只能为奖励提供机会","光有练习而无满意的效果不能导致学习的进步","多练习产生疲劳","缺乏正确指导的练习易形成错误习惯"]
What should an administrator do to allow the logon of a user to a local system without limitations from the host ‘webserver’?() ["configure the \/etc\/.rhosts with. webserver <user>","configure the root'$HOME\/.rhost file with.+webserver <user>","configure each user's $HOME\/.rhosts file with. webserver <user>","configure the root'$HOME\/.rhost file with.<webserver ip> <user>"]
公共政策的权威性来源于它的()。 ["外部性","内部性","排他性","非排他性"]
偏航系统特点