焊接方式按其操作位置不同,结构形式可分为( )、横焊和仰焊四种情况。
A.内焊
B.外焊
C.平焊
D.立焊
参考答案:C,D
My keys are under the desk. Can you pick _________ for me?[ ]
A. it
B. it up
C. them up
Given the following income statement:()
A.0.30
B.0.36
C.0.25