What does Jenny offer to do for Don?
A.Teach him how to write a poem.
B.Help him with his maths.
C.Walk with him to the library.
第7题
不同厚度的钢板对接焊时,要求对厚板进行削薄处理的目的主要是避免接头处()。
A.焊接性能变坏
B.力学性能明显下降
C.造成过高的应力集中
D.产生较严重的焊接缺陷
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