They had an accident on the road and didn't ______ at their hotel until after midnight. [ ]

A. check out

B. check on

C. check in

D. check over

在一展览馆的楼面上，有一静止的展品及其墩座，其自重的标准值共为30kN；墩座经厚50mm的垫层坐落在板跨为3m(单向板)、板厚为150mm的钢筋混凝土楼板上。该展品的四周无其他展品的展览区(图6-13)。

确定高度100m处围护结构的风荷载标准值最接近于（）kN/m²。

A．1.616

B．1.945

C．2.462

D．2.505