What isthe essential characteristic of colloid? A: Tyndall effect B: Brownian motion C: Colloidal particles size ranges from1nmto 100nm D: colloidal particles charged

If shipment is to be made during September/October，when should you ship the goods____ A: from September 1 to October 1 B: from September 1 to October 31 C: from September 30 to October 31 D: from September 1 to October 30

写出条件查询“表1 里的字段1的id是多少”（） A: select * from 表1 where字段1=“值” B: select id from 表1 where字段1=“值” C: select id from 字段1 where表1=“值” D: select id from 表1

1 This is a letter from __________ to _____________.

1.toddler age is from what time to what time? A: from delivery to 1 year old B: from 1 to 3 years old C: from fertilized ovum to delivery D: from umbilical ligation to 28thday E: from 6-7 years old to adolescence

查询“学生”表中“学号 char(10)”尾字符是"1"的错误命令是（ ）。 A: SELECT * FROM 学生 WHERE 学号 LIKE '_1' B: SELECT * FROM 学生 WHERE 学号 LIKE '%[1]' C: SELECT * FROM 学生 WHERE 学号 LIKE '%1' D: SELECT * FROM 学生 WHERE RIGHT(学号,1)='1'

下面检索结果一定不是一行的命令： A: select distinct * from orders ; B: select * from orders limit 1，2; C: select top 1 * from orders; D: select * from orders limit 1;

以下可以正确运行的查询语句有( ) A: select * from user ; B: select * from user where username =’李四’; C: select * from user where 1=1; D: select distinct * from user;

查询学生表中学号(字符型,长度为2)末尾字符是"1"的错误命令是( ). A: SELECT * FROM 学生 WHERE SUBSTR(学号,2,1)="1" B: SELECT * FROM 学生 WHERE "1" $ 学号 C: SELECT * FROM 学生 WHERE SUBSTR(学号,2)="1" D: SELECT * FROM 学生 WHERE RIGHT(学号,1)="1"

查询订购单号（字符型，长度为4）尾字符是1的错误命令是（）。 A: SELECT＊FROM订单WHERESUBSTR(订购单号，4）＝，，1”         B: SELECT＊FROM订单WHERESUBSTR（订购单号，4，1卜，，1”          C: SELECT＊FROM订单WHERE”1”＄订购单号          D: SELECT＊FROM订单WHERERIGHT（订购单号，1）＝"1”