一篇课文几次备课，即摆进自我、广泛涉猎、边教边改，成就了上海著名特级教师（）。
什么是电容器？
Which two statements are true about constraints? （） [" The UNIQUE constraint does not permit a null value for the column."," A UNIQUE index gets created for columns with PRIMARY KEY and UNIQUE constraints."," The PRIMARY KEY and FOREIGN KEY constraints create a UNIQUE index."," The NOT NULL constraint ensures that null values are not permitted for the column."]
Which two statements are true about Shared SQL Area and Private SQL Areas（） ["Shared SQL Area will be allocated in the shared pool.","Shared SQL Area will be allocated when a session starts.","Shared SQL Area will be allocated in the large pool always.","The whole of Private SQL Area will be allocated in the Program Global Area （PGA） always.","Shared SQL Area and Private SQL Area will be allocated in the PGA or large pool.","The number of Private SQL Area allocations is dependent on the OPEN_CURSORS parameter."]
土壤环境中的铜绿假单孢菌属于（） ["专性好氧菌","兼性厌氧菌","微好氧菌","厌氧菌"]
国家电网公司对风电场电压控制的要求是什么？
