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??????????mm 2.0 2.5 2.8 3.2 3.5 3.8 4.0 4.5
???????c 1.064 1.051 1.045 1.040 1.036 1.034 1.032 1.028
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????????????/Mpa??D10.2-168.3mm?3Mpa??D177.8-323.9mm?5Mpa
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