皮皮学，免费搜题
登录
搜题
【单选题】
下面正确表示Employees表中有多少非NULL的Region列的SQL语句是( )A.
SELECT count(* ) from Employees
B.
SELECT count(Region) from Employees
C.
SELECT count(Distinct Region) from Employees
D.
SELECT sum(ALL Region) from Employees
手机使用
分享
复制链接
新浪微博
分享QQ
微信扫一扫
反馈参考答案：
举一反三
【单选题】Why can it be said that techno music will always be around?
A.
it won’t, it will go out of style
B.
it is beautiful and meaningful
C.
the lyrics are poetic
D.
it’s dance music, and people will always love to dance, so they’ll need techno music
【单选题】Today's expression, ' Knowledge is _____ ,' is widely misunderstood. The more you know, the more ____ you will be.
A.
power, successful
B.
power, success
C.
powerful, successful
D.
powerful, success
【单选题】To learn more information about the exhibition, yo can ___________.
A.
send an email
B.
make a phone call
C.
pay a visit to the exhibition
D.
visit the organizer ’ s website
【单选题】在含有Fe 3+ 和Fe 2+ 的溶液中，加入下述何种溶液，Fe 3+ /Fe 2+ 电对的电位将升高(不考虑离子强度的影响)( )。
A.
稀H 2 SO 4
B.
HCl
C.
NH 4 F
D.
邻二氮菲
【简答题】在含有Fe 3+ 和Fe 2+ 的溶液中，加入下述何种溶液，Fe 3+ /Fe 2+ 电对的电势将升高(不考虑离子强度的影响)?( ) (A) 稀H 2 SO 4 。 (B) HCl。 (C) NH 4 F。 (D) 邻二氮菲。
【单选题】It seems that the more lovely an animal is , the more it _____our health. As the saying goes, “if you want to be loved, get a dog.”
A.
harms
B.
troubles
C.
benefits
D.
treats
【简答题】动词填空 1. There ______ ( be) six singers in the band last night. 2. Car is more and more popular, you'd better _____(learn) to drive. 3. Jordan ________ (be) born in 1975. 4. Fred _______ (visit) his co...
【单选题】在含有Fe2+和Fe3+的溶液中，加入下述( )溶液，Fe2+／Fe2+电对的电位将降低(不考虑离子强度影响)。
A.
邻二氮菲
B.
HCl
C.
H3PO4
D.
H2SO4
相关题目：
参考解析：
知识点：
题目纠错 0
发布
