采用矿渣水泥拌制的大体积混凝土的浇水养护时间不得少于（）日。 ["7","14","15","21"]
Which command is used to open the database after an incomplete recovery？（） [" alter database open"," alter database open repairlog"," alter database open resetlogs"," alter database open resetlog"," alter database resetlogs ope"]
What is the result？（） ["The code runs with no output.","An exception is thrown at runtime.","Compilation fails because of an error in line 20.","Compilation fails because of an error in line 21.","Compilation fails because of an error in line 23.","Compilation fails because of an error in line 25."]
万用表用完后，应将转换开关置于（）。 ["最高电阻挡","最高交流电压档","最高电流档"]
简述结构游戏的基本结构。
致密度
