焊件开坡口时，该面沿焊件厚度方向未开坡口的端面部分叫______。_爱下问搜题

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问题填空题

焊件开坡口时，该面沿焊件厚度方向未开坡口的端面部分叫______。

答案

参考答案：钝边

选择题

Mr. Smith _____ live in a big city before. But now he _____ the life in the new town.

A. used to; is used to
B. was used to; used to
C. used; will be used to
D. is used to; has been used to

判断题

细胞衰老和死亡不止发生在生物个体衰老时。