All electrical appliances aboard a vessel should be grounded to().
A. prevent them from falling when the vessel rolls
B. protect personnel from electrical shock
C. increase their operating efficiency
D. prevent unauthorized personnel from operating them
斜坡上陈列的商品,至少每()周更换以给到顾客新鲜感。
A. 1
B. 2
C. 3
D. 4
把对关系SC的属性GRADE的修改权授予用户ZHAO的SQL语句是 ()
A. GRANT GRADE ON SC TO ZHAO
B. GRANT UPDATE ON SC TO ZHAO
C. GRANT UPDATE (GRADE) ON SC TO ZHAO
D. GRANT UPDATE ON SC (GRADE) TO ZHAO