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车站出入口通道总数不得少于（）

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轨道区段的颜色含义：绿色：_____黄色：_红色：_；站名颜色的含义：白色：绿色：白色闪烁：_绿色闪烁：_________。

强制性脊柱炎的特异性指标是哪个？

A. RF
B. ESR
CRP
D. HLA-B27

you recognize an idiom when it is being used, it is easy to misunderstand what you read or hear spoken.

A．Unless
B．After
C．Once
D．Since

A:－What would you like to do this weekend? B:－ .It's up to you.

A．Whatever.
B．Definitely.
C．Go ahead.
D．Good idea.