The first prize winner _______, John was so disappointed that he felt unwilling to know the rest of the results.

A．announcing

B．announced

C．having announced

D．had been announced

盖梁是指桩柱墩墩帽，除装配式的以外，需要现场立模浇筑。现浇混凝土盖梁施工应控制好模板设计、支架搭拆、预应力张拉三大环节的特殊点。

对于高度较高的盖梁，脚手架应相应设置多层作业通道，确保脚手架防护高度高于施工作业面( )以上；

A．0.5m

B．1m

C．1.5m

D．2m