什么叫过梁?
参考答案:墙体上开设洞口,支承洞口上部荷载的横向构件叫过梁。
—Come on, please give me some ideas about the project.
—Sorry. With so much work my mind, I almost break down.
A.filled
B.filling
C.to fill
D.being filled
泵房一旦发生火灾,首先切断()用不导电的()灭火。