在横向活动支座（HX）和多向活动支座（DX）处，防落梁挡块严禁与墩台顶面、支承垫石（）接触。
参考答案：侧面
--Have you _____ the invitation to the party? --Yes, I have. And I've ______ it.
A．accepted, received
B．received, accepted
C．received, received
D．accepted, accepted
《煤矿安全规程》规定采掘工作面进风流中二氧化碳的浓度不得超过（）
A.0.5%
B.0.75%
C.1%
