题目内容

论述因素比较法的实施步骤及其优缺点。

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电梯使用完毕后,应做好()和交接班手续。

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

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