Which of the following is true of an index used to support a UNIQUE constraint?（） ["It must have the UNIQUE attribute.","It cannot be created explicitly by the user.","It must have the UNIQUE and CLUSTER attributes.","It must have the UNIQUE WHERE NOT NULL attribute."]
路由器命令R1（config）#inprouting的作用是（）。 ["显示路由信息","配置默认路由","激活路由器端口","启动路由配置"]
kristin wants to build an action which exits the video form. the action will be avaiable only when the user is reading the document ,which one of the following accomplish this ? （） ["@ command([back]) ","@ command([fileexit]) ","@ command([gotoview]) ","@ command([fileclosewindow])"]
血清结合珠蛋白测定，下列何项是不正确的（） ["电泳法","酶联免疫法","比色法","免疫电泳法"]
A user reports that they cannot cd to /tmp/application. A system administrator entered the following command： （1）ls -ld /tmp/application （2）drw-r--r-- 4 root system 512 Jan 15 14：09 application What is the most likely cause of the problem？（） ["The \/tmp\/application should be globally writable.","The \/tmp\/application directory should be executable.","The \/tmp\/application directory should be owned by the user.","The \/tmp\/application directory should have the sticky bit set."]
当前我国的餐饮企业的组织形式有哪几种？
