ygs67 发表于 2016-1-16 16:44:01

ASTM D6760-14

ASTM D6760-14 Standard Test Method for Integrity Testing of Concrete Deep Foundations by Ultrasonic Crosshole Testing

admin 发表于 2016-1-18 12:27:21

谢谢您的分享,金币已奖励!

pengyuewang 发表于 2016-9-10 10:33:01

金幣不夠怎麼辦～～～
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