烈性噬菌体对细菌的侵染过程？
以下属于“九叶诗派”的诗人是（） ["杜运燮","绿原","艾青","流沙河"]
The database users are connecting to the PROD database from different applications， thereby degrading the database performance. The senior database administrator suspects the large number of concurrent connections to be the reason for low performance and asks you to restrict the number concurrent connections per database user to one. Which action would you take to achieve this objective？（） ["set the SESSIONS to 1 in the parameter file","grant SINGLE SESSION privilege to all of the users","set the SESSIONS_PER_USER to 1 in the users’ profile","grant RESTRICTED SESSION privilege to all of the database users","create a role with SINGLE SESSION privilege and assign the role to the user"]
线缆在走线架的每一根横档上均应绑扎（或用尼龙锁紧扣卡固定），绑扎线扣（或卡固点）松紧适度，绑口一致。室外走线一定用（）色扎带绑扎。 ["白","黄","红","黑"]
Which datatype is returned by the FIND_MENU_ITEM built-in function?（） ["number ","Boolean ","menuitem ","VARCHAR2&e"]
怎样理解资产评估的市场性特点？
