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【判断题】
A,B为n阶矩阵,cond(AB)<=cond(A)cond(B)。()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】The doors in German offices and homes are generally kept _____.
A.
wide open to symbolize a welcome of friends and strangers
B.
slightly ajar to suggest that people should knock before entering
C.
half open suggesting that some people are welcome and some are not
D.
tightly shut
【单选题】Who are the worst sleepers based on a survey of the people in 13 countries around the world?
A.
The French people.
B.
The German people.
C.
The British people.
D.
The American people.
【单选题】Q: Stalin was not prepared for Hitler's attack. What did he do in the face of the German invasion? He instructed the Russian people to “ _________ ” in front of the German invaders.
A.
scratch the earth
B.
scorch the earth
【简答题】氯化物检查中，配制标准氯化钠溶液1000ml（ ）。
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