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【判断题】
“机器人”下的定义:“一种可以反复编程和多功能的,用来搬运材料、零件、工具的操作机。A.
正确
B.
错误
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皮皮学刷刷变学霸
举一反三
【单选题】You will succeed in the end _____________ you give up halfway.
A.
if
B.
unless
C.
now that
D.
Until
【单选题】下列SQL句中,能够实现参照完整性控制的语句是()。
A.
FOREIGN KEY
B.
PRIMARY KEY
C.
REFERENCES
D.
FOREIGN KEY 和REFERENCES
【单选题】Up until now, scientists still could not explain how leaves will change colors during the fall.
A.
Y
B.
N
C.
NG
【简答题】A．Add up the figures once more now. B．Put off the calculations until tomorrow. C．Take a rest first and finish the figures today. D．Try calculating the figures for the last time.
【单选题】Up until now, Queen Elizabeth has ruled in Britain for over __________ decades.
A.
three
B.
four
C.
five
D.
six
【单选题】下列SQL语句中，能够实现参照完整性控制的语句是：( )。
A.
FOREIGN KEY
B.
PRIMARY KEY
C.
REFERENCES
D.
FOREIGNKEY和REFERENCES
【简答题】ad. until this time, up to now
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