在电弧焊中，具有熔深大、生产率高、机械化程度高，适宜于焊接中厚板结构的长焊缝，此种焊 发布时间：2017-06-16 14:45 │ 来源：www.tikuol.com 题型：单项选择题 问题： 在电弧焊中，具有熔深大、生产率高、机械化程度高，适宜于焊接中厚板结构的长焊缝，此种焊接方法为( )。A．等离子弧焊B．压力焊C．钎焊D．埋弧焊
题型：单项选择题 根据图片选择正确的答语。( ) 1. What's this?A. It's a pear. B. It's a lemon.( ) 2. What's that?A. It's a pineapple. B. It's an apple.( ) 3. Is this a kiwi fruit?A. Yes, it is. B. No, it isn't.( ) 4. Is that a strawberry?A. Yes, it is. B. No, it isn't. 查看答案
What's this?
What's that?
Is this a kiwi fruit?
Is that a strawberry?