焊缝按结合形式的不同分为对接焊缝、（）端接焊缝、塞焊缝等
A.I形焊缝
B.角焊缝
C.封底焊缝
参考答案：B
Large quantities of solid fuel ______consumed every day and too much carbon dioxide is sent into the air, which in turn _______ the going up of temperature. [ ]
A. is; results in
B. are; results in
C. is; leads to
D. are; results from
