钢筋（）可用于钢筋接长、钢筋骨架及预埋件等的焊接。
A.弧焊机
B.对焊机
C.点焊机
D.气焊机
参考答案：A
—Is that a baseball?
—______.[ ]
A. Yes, that is.
B. No, it isn't.
C. Yes, it's.
D. It's a baseball.
A bond is needed when the bill of lading cannot be availed of the time of entry of the im- ported commodities. What does the sentence mean.（）
A. A bond is needed when the bill of lading is unavailable when the goods arrive at the destination.
B. A bond is needed when the bill of lading arrives at the port of destination.
C. A bond is not needed when the goods arrive at the destination.
D. A bond is needed when the goods arrive at the destination if there is no bill of lading at all.
