单项选择题
The next morning people found the world outside their h...
单项选择题The next morning people found the world outside their houses completely ____.（
两块钢板当采用角焊缝连接时，两焊角边的夹角小于( )时不宜作为受力焊缝。A.300B.450C.600D.9...
单项选择题两块钢板当采用角焊缝连接时，两焊角边的夹角小于( )时不宜作为受力焊缝。
Tom attended ____ evening school for ____ month or two....
单项选择题Tom attended ____ evening school for ____ month or two.（ ）
