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螺纹的标注法是依螺纹方向 螺纹线数 螺纹符号 螺纹大径 .....
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Night() fallen the girl studying in her room switched on the light to do more reading...
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()has been a long time since we presented this play...
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尺寸标注上的数值应避免公式的表示而没有标示计算结果。()..
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People get wiser and more experienced()the increase of age...
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At last I decided to pay a visit to my new gen.....
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