青工赛（2）

X4K集装箱专用平车中梁为Q450NQR1高强度耐候钢组焊（）结构。

发布于 2021-02-18 12:53:20

【单选题】
A 箱形
B 变截面
C 鱼腹形
D 箱形变断面的鱼腹形

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娇娇嗯啊 2023-02-18

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