选择题：4 、预裂爆破就是要在开挖线上形成一条足够宽度的裂缝，其目的是为了。（）A ．保护爆破

题目内容：

4 、预裂爆破就是要在开挖线上形成一条足够宽度的裂缝，其目的是为了。（）
A ．保护爆破区岩体免遭破坏 B ．保护爆破区岩体，以免能量损失
C ．消减爆破区的冲击波能量，保护保留区岩体免遭破坏

参考答案：

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