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复杂的管道可采用建立背压的方法进行清管、测径。
Complex pipe can be established by the method of back pressure pigging, caliper.
youdao
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规格：高背，中背，弯管。
Size:high back, medium back, low back, cantilever.
youdao
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规格：高背，中背，弯管。
Size:high back, medium back, low back, cantilever.
youdao