Tom taller than his brother.[ ]
A. is
B. am
C. are
答案：A
施工升降机应能在环境温度为-20到+40℃条件下正常工作。超出此范围时，由用户与制造商协商解决。（）
“把查询sc表和更新sc表的grade列的权限受予用户user1”的正确SQL语句是( )。
A．GRANT SELECT，UPDATE(grade)ON TABLE sc TO user1
B．GRANT SELECT sc，UPDATE sc，grade TO user1
C．GRANT SELECT，UPDATE ON TABLE sc．grade TO user1
D．GRANT SELECT ON TABLE sc，UPDATE ON TABLE sc(grade)TO user1
