设一平面经过原点及点(6，-3，2)，且与平面4x-y+2z=8垂直，则此平面方程为 ()。
A. 2x+4y-z=0
B. 2x+2y-3z=0
C. 2x+y-Z=0
D. x+2y-3z=0
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检索至少有一名职工信息的“仓库号”及仓库的“所在地”和“人数”，正确的SQL命令是()。
A. SELECT 仓库号,所在地,人数 FROM 仓库 WHERE IN; (SELECT 仓库号 FROM 职工 WHERE 仓库号=职工.仓库号)
B. SELECT 仓库号,所在地,人数 FROM 仓库 WHERE 仓库号 IN; SELECT 仓库号 FROM 职工 WHERE 仓库号=仓库.仓库号)
C. SELECT 仓库号,所在地,人数 FROM 仓库 WHERE NOT EXISTS; (SELECT 仓库号 FROM 职工 WHERE 仓库号=仓库.仓库号)
D. SELECT 仓库号,所在地,人数 FROM 仓库 WHERE EXISTS; (SELECT 仓库号 FROM 职工 WHERE 仓库号=仓库.仓库号)
为“仓库”表增加一个“面积”字段，类型为数值型，宽度是7，小数位数为2，正确的命令是()。
A. CREATE TABLE仓库ADD面积N(7,2)
B. CREATE TABLE仓库ALTER面积N(7,2)
C. ALTER TABIE仓库ADD面积N(7,2)
D. LTER TABLE仓库ALTER面积N(7,2)
The main idea of the first paragraph is______.
A. manners change with countries
B. everything depends on manners
C. manners are unimportant
D. behaviour (行为) with good manners
The words "did so" in the last sentence mean______.
A. said those words
B. felt in his pocket
C. paid the bill
D. caught the train back to London
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