The metal pipe shall be firmly grounded or the refractory tube.
金属管应牢靠接地或选用耐火资料管。
Steel tube length or double length delivery, for steel pipe bending degree requirements.
钢管以定尺或倍尺交货，对钢管弯曲度有一定要求。
Steel tube length or double length delivery, for steel pipe bending degree requirements.
钢管以定尺或倍尺交货，对钢管弯曲度有一定要求。
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