不定项选择题:下列关于在特殊场合安装一次部件的规定不正确的是(  )。

题目内容:
下列关于在特殊场合安装一次部件的规定不正确的是(  )。 A.工艺设备一般为预留孔。不准随便开孔,衬胶管道不允许用气焊开孔
B.一次部件安装在高压、合金钢、有色金属的工艺管道和设备上,必须用气焊方法开孔
C.需要进行无损探伤的管道上的部件及焊缝,都要按规定进行无损探伤
D.需要进行脱脂的工程,其一次部件及仪表的回路系统与介质接触部分都需要进行脱脂
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