多项选择题
下列关于火灾的正确说法有（ ）
A．毁坏财物
B．破坏生态平衡
C．残害人类生命
D．引起不良的社会和政治影响
下列关于火灾的正确说法有（ ）
A．毁坏财物
B．破坏生态平衡
C．残害人类生命
D．引起不良的社会和政治影响
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单项选择题
Which surface is working surface of square and rectangular key joint?
Which surface is working surface of square and rectangular key joint?
A．Upper surface
B．Lower surface
C．Side surface
D．End surface
单项选择题
A．A
B．B
C．C
D．D
单项选择题
Gale-Shapley algorithm finds______.
Gale-Shapley algorithm finds______.
A．a perfect matching without stability
B．possible different assignments among all executions
C．the man-optimal assignment which is a stable matching