埋弧焊熔合比最小，电弧搅拌作用强烈，形成的过渡层比较均匀，是异种钢焊接应用极为广泛的焊接方法。( )
参考答案：错
完成句子，使改写后的句子完整，并与原句意思相符，注意每空只填一个单词。
1. Although he is a child, he is good at taking photos.
Although he is a child, he ___________ ___________ ___________ taking photos.
2. They plan to go to Hong Kong for vacation.
They __________ __________ to Hong Kong for vacation.
3. Our English teacher often rides to school.
Our English teacher often__________ to school __________ a bike.
4. Could you play the violin at the age of five?
__________ you __________ to play the violin at the age of five?
5. I have four apples. Jack has six apples.
I have __________ apples __________ Jack.
创伤性溃疡的临床特征为（）
A.溃疡形态不规则，边缘隆起，溃疡形态与刺激物相吻合
B.溃疡深大，呈菜花状，基底及边缘硬，有浸润，疼痛不明显
C.溃疡边缘不规整，基底有桑葚状小结节，疼痛明显
D.溃疡深大，边缘隆起，呈弹坑样，表面有灰黄色假膜，基底软
E.溃疡表浅，为圆形或椭圆形，表面有灰黄色假膜，周围红晕
though he is a child, he is good at taking photos.