是以集中的高速电子轰击工件表面所产生的热能进行焊接的方法。
A. 激光焊
B. 电子束焊
C. 电阻焊
D. 等离子弧焊
查看答案
The parents were much kinder to their youngest child than they were to the other, ______,
A. which
B. that
C. what
D. who
How many years did it take to complete the connection of recordings？
A. 26 years.
B. 33 years.
C. 44 years.
D. 57 years.
可根据标准编制无损检测工艺，审核或签发检测报告，解释检测结果，仲裁Ⅱ级人员对检测结论的技术争议的是()无损检测人员。
A. Ⅰ级(初级)
B. Ⅱ级(中级)
C. Ⅲ级(高级)
D. 特级
What do the storyteller tell us about？
A. How they were brought to the United States from Africa.
B. The release of the collection of recordings.
C. What happened 60 years after their emancipation？
D. Their experiences as slates and their lives as free men and women.
微信支付 
支付宝支付