They don’t allow ______ here. That is to say, we are not allowed _____ here.

A．to smoke; to smoke

B．smoking; smoking

C．to smoke; smoking

D．smoking; to smoke

隐框或半隐框玻璃幕墙玻璃与铝合金之间采用哪种胶进行粘结（）

A.聚硅氧烷玻璃密封胶

B.聚硅氧烷结构密封胶

C.聚硅氧烷玻璃胶

D.中性聚硅氧烷结构密封胶