—Would you like ______ cake?
一No, thanks. I'm full. [ ]
A. another
B. other
C. else
答案:A
低压碳素钢管公称直径大于50mm的,用( )坡口。
A.手提砂轮打磨
B.氧-乙炔切割
C.车床加工
D.手工锉