问题:
A . 螺栓(锚栓)露出长度+30.0mm,0.0mmB . 螺栓(锚栓)露出长度+20.0mm,0.0mmC . 螺栓(锚栓)露出长度+30.0mm,5.0mmD . 螺纹长度+30.0mm,0.0mmE . 螺纹长度+20.0mm,0.0mm
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