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Small corner in the pipe line or permitted under conditions of constant use of natural elbow.
在管道线路转角较小或条件容许的情况下常采用自然弯管法。
youdao
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Small corner in the pipe line or permitted under conditions of constant use of natural elbow.
在管道线路转角较小或条件容许的情况下常采用自然弯管法。
youdao