液化气体是指临界温度等于或大于（）℃的气体。 ["-10","0","10","20"]
View the Exhibit and examine the privileges granted to the MGR_ROLE role. The user SKD has been granted the CONNECT and RESOURCE roles only. The database administrator （DBA） grants MGR_ROLE to the user SKD by executing the command： SQL> GRANT MGR_ROLE TO SKDWITH ADMIN OPTION； Which statement is true about the user SKD after he/she is granted this role（） ["The user SKD can grant only the MGR_ROLE role to other users， but not the privileges in it. ","The user SKD can revoke the MGR_ROLE only from the users for whom he\/she is the grantor.","The user SKD can grant the privileges in the MGR_ROLE role to other users， but not with ADMIN OPTION.","The user SKD can grant the privileges in the MGR_ROLE role to other users， but cannot revoke privileges from them."]
变压器的瓦斯保护的启动是靠（）。 ["电气动作","机械动作","油流和气流的运动"]
（）是无形资产。 ["房屋","应收账款","应付票据","商标权"]
下列密封中，属于接触式密封的是（）。 ["机械密封","填料密封","迷宫密封","波纹管密封"]
遗传和变异的共同点有哪些？不同点有哪些？
