【判断题】泡沫灭火时如有风,应顺风喷射泡沫,避免横风喷射。( )
【单选题】Will loved to see plays. When the Queen's Men came to his town in June, Will found that ______.
A.
their play were poetic
B.
their play was exciting
C.
their play was foolish
【简答题】完形填空。 Three men came to London 1 holidays. They came to a very large hotel(旅馆)and lived in a room on the forty-fifth floor. One day they went to see a film and came back to the hotel very late. 'I'm v...
【简答题】完形填空( 10 分) Three men came to London 1 hoidays. They came to a very large hotel and lived in a fifty –fifth floor. One day .they went to see a film and came back to the hotel very late. “ I’m very _2...
【简答题】完形填空。 Three men came to London 1 holidays. They came to a very large hotel (旅馆) and lived in a room on the forty-fifth floor. One day they went to see a film and 2 the hotel very late. 'I'm very sorry...
【多选题】下列说法正确的是()
A.
滤料的不均匀系数愈大,则滤料愈不均匀,滤料的空隙率和纳污能力提高
B.
垫层填充于滤层与集(配)水系统之间,其作用是过滤时阻挡滤料进入集水系统,反洗时还能起均匀布水作用
C.
水处理中过滤工艺的主要作用是降低水的浊度,去除悬浮和脱稳的胶体颗粒物(包括细菌、病毒,有机物等)
D.
滤料的纳污能力是在保证出水水质的前提下,在过滤周期内单位体积滤料中能截留的污物量
【判断题】平面一般力系向其平面内任一点简化,如主矩恒等于零,则力系一定平衡。
【简答题】平面一般力系向其平面内任一点简化,如主矩恒等于零,则力系( )。
【单选题】填料层的空隙率大,则下列说法正确的是( ) 。