焚风()
A.是一种干热风
B.发生在山的迎风面
C.A.B都对
D.A.B都错
参考答案:A
It is agreed _______ there is a river, there is a city.
A.that
B.where
C.that where
D.there which
下列各种焊接方法中,产生()氮氧化物最多的是等离子弧焊接与切割
A.辐射
B.燥声
C.金属粉尘
D.臭氧