__________ there are a large number of chemical factories，the air is likely to be polluted.

A．That

B．Where

C．Once

D．As

建筑工程施工安全技术

现浇柱模板的拆除顺序是( )拆除。

A．自下而上

B．自上而下

C．从两边向中间

D．从中间向两边