发布时间:2025-01-30 23:02:40
GB/T 6728--2002 60×40方管的壁厚有2.0mm 2.5mm 3.0mm 4.0mm.
壁厚2.75mm可以用,但要看用在什麽位置及受力情况.
我想在日本买一个索尼的mp4在国内卖2299请问在日本卖多少啊有会算的吗
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