更多"There are 65()of Grade No.3 rubber "的相关试题:
[单项选择]Grade No.1 rubber bales are mixed up()grade No.4.
A. by
B. from
C. with
D. against
[单项选择]There are 65()of grade No.3 rubber short.
A. bags
B. bales
C. sacks
D. cases
[单项选择]Regulations require that tankers handling grade B liquids shall have their cargo pumps separated from all sources of vapor ignition by().
A. cofferdams
B. empty cargo spaces
C. gas tight bulkheads
D. areas equipped with power ventilation
[单项选择]All the rubber bales were separated().
A. by grade
B. by a grade
C. by the grade
D. by the grades
[单项选择]Clean air standards referred to as “Grade D” apply to compressed air for use in().
A. high pressure fluid accumulators
B. driving air-powered plunger pumps
C. filling open-circuit breathing systems
D. bladder-type accumulators
[单项选择]An example of a grade C product is().
A. naphtha,vm and p
B. tridecanol
C. cottonseed oil
D. camphor oil
[单项选择]An example of a grade B product is().
A. piperyline
B. motor gasoline
C. kerosene
D. mineral spirits
[单项选择]The words such as quantity, grade, viscosity and specific gravity should be in the ().
A. repair list
B. spare parts order list
C. price list
D. bunker list
[单项选择]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
[单项选择]在linux系统中,更改组class的组名为grade,应执行()命令。
A. groupmod -l grade class
B. groupmod -n grade class
C. chgroup -l grade class
D. chgroup -n grade class
[单项选择]设在某SELECT语句的WHERE子句中,需要对Grade列的空值进行处理。下列关于空值的操作,错误的是()。
A. Grade IS NOT NULL
B. Grade IS NULL
C. Grade = NULL
D. NOT (Grade IS NULL)
[单项选择]成绩表grade中字段st_id代表学号,score代表分数,以下()语句返回成绩表中的最低分。
A. SELECT max(score) FROM grade
B. SELECT TOP 1 score FROM grade ORDERBY score ASC
C. SELECT st_id,MIN(score) FROM grade
D. SELECT TOP 1 score FROM grade ORDERBY score DESC
[单项选择]设有关系SC(S,C,GRADE),主码是(S,C)。遵照实体完整性规则()
A. 只有S不能取空值
B. 只有C不能取空值
C. 只有GRADE不能取空值
D. S与C都不能取空值
[单项选择]学生成绩表grade中有字段score(float),现在要把所有在55至60分之间的分数提高5分,以下SQL语句正确的是()。
A. Update grade set score=score+5 where score in 55..60
B. Update grade set score=score+5 where score >=55 AND score <=60
C. Update grade set score=score+5 where score between 55 or 60
D. Update grade set score=score+5 where score <=55 and score >=60
[单项选择]设有关系SC(SNO,CNO,GRADE),主码是(SNO,CNO)。遵照实体完整性规则()。
A. 只有SNO不能取空值
B. 只有CNO不能取空值
C. 只有GRADE不能取空值
D. SNO与CNO都不能取空值
[单项选择]学生选课信息表:sc(sno,cno,grade),主键为(sno,cno),从学生选课信息表中找出无成绩的元组的SQL语句是()。
A. SELECT * FROM sc WHERE grade=NULL
B. SELECT * FROM sc WHERE grade IS “ ”
C. SELECT * FROM sc WHERE grade=‘ ’
D. SELECT * FROM sc WHERE grade IS NULL
[单项选择]设关系数据库中有一个表S的结构为S(SN,CN,grade),其中SN为学生名,CN为课程名,二者均为字符型;grade为成绩,数值型。若要把“郑欣的化学成绩80分”插入S表中,正确的语句是()。
A. ADD INTO S VALUES(‘郑欣’,‘化学’,‘80’)
B. INSERT INTO S VALUES(‘郑欣’,‘化学’,‘80’)
C. ADD INTO S VALUES(‘郑欣’,‘化学’,80)
D. INSERT INTO S VALUES(‘郑欣’,‘化学’,80)
[单项选择]设关系数据库中的一个表S的结构为:S(SN,CN,grade),其中SN为学生名,CN为课程名,二者均为字符型grade为成绩,数值型,取值范围0~100若要更正王二的化学成绩为85分,则可用以下哪条语句进行更新()
A. UPDATESSETgrade=85WHERESN=’王二’ANDCN=’化学’
B. UPDATESSETgrade=85WHERESN=王二ANDCN=’化学’
C. UPDATEgrade=85WHERESN=’王二’ANDCN=’化学’
D. UPDATEgrade=’85’WHERESN=’王二’ANDCN=’化学