单选题：自动化仪表工程的高压管道上开孔时，应采用（　　）的方法。

题目内容：
自动化仪表工程的高压管道上开孔时，应采用（　　）的方法。 A．气割加工
B．机械加工
C．电弧加工
D．凿子加工

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答案解析：

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