删除student表的“平均成绩”字段的正确SQL命令是A．DELETE TABLE

发布时间：2017-06-13 15:38 │ 来源：www.tikuol.com

题型：单项选择题

问题：

删除student表的“平均成绩”字段的正确SQL命令是

A．DELETE TABLE student DELETE COLUMN平均成绩

B．ALTER TABLE student DELETE COLUMN平均成绩

C．ALTER TABLE student DROP COLUMN平均成绩

D．DELETE TABLE student DROP COLUMN平均成绩

考点：计算机等级考试 VISUAL FOXPRO 全国计算机等级考试二级VISUAL FOXPRO真题2011年3月

题型：单项选择题

完型填空。

     My name is Li Ming. I live    1    Shijiazhuang. In summer, I like, sitting    2    the window. I can look
   3   a big tree. There are three birds    4    the tree (a mother bird and her two babies). But one day, I
suddenly found a snake    5   up the tree. It climbed towards the nest (鸟巢). The mother bird chirped (叫)
loudly. She flew around the snake. Just at that time, hundreds    6    birds flew here, They began to peck
(啄) the snake. The snake    7   off the tree and ran away (逃跑).

( ) 1. A. of
( ) 2. A. on
( ) 3. A. in
( ) 4. A. at
( ) 5. A. running
( ) 6. A. and
( ) 7. A. jumped

B. on
B. to
B. at
B. on
B. look
B. of
B. ran

C. in
C. over
C. like
C. in
C. call
C. /
C. goes

D. with
D. near
D. to
D. up
D. climbing
D. about
D. fell

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在使用热效式瓦检器，如被测地点空气中湿度大，会造成测定结果（）。

A、偏低

B、不影响

C、可能高也可能低

D、偏高

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乳腺囊性增生病的临床表现是

A． * * 血性溢液
B． * * 肿块伴周期性胀痛
C． * * 内无痛肿块
D． * * 急性红肿伴肿块

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