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问题:
[单选]
如图所示,在图像1中是一个选区,那么在选区工具的选项栏中选择()可以添加至图像2的选区效果。

A . A
B . B
C . C
D . D
氢脆性
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某上程施工中出现质量事故,造成8人死亡,重伤150人,直接经济损失200万元,此类工程事故为()。 一般事故。 较大事故。 重大事故。 特别重大事故。
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如图所示,在图像1中是一个选区,那么在选区工具的选项栏中选择()可以添加至图像2的选区效果。
