优质配件的焊缝厚度应均匀整齐,表面无波纹、夹渣和裂纹等缺陷。()
参考答案:对
On the sea near Diaoyu Island, ____ Chinese fishing boat was stopped by the Japanese and ___ sailors
were arrested illegally.[ ]
A. a; the
B. the; the
C. a; 不填
D. the; 不填
以下不是双糖的是()。
A.海藻糖
B.蔗糖
C.果糖
D.乳糖
E.麦芽糖