题目内容

筒节组对前，根据每圈板片数和封头端部实际周长在钢平台上画出筒体基准圆，在基准圆内侧每隔()焊一块定位板。

A. 500 mm
B. 500～1 000 mm
C. 1 000～1 500 mm
D. 1 500～2 000 mm

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