《铁路货车站修规程》规定：中梁、侧梁在枕梁间的下垂辅修限度不大于（)。

A.20mm

B.30mm

C.40mm

D.50mm

A.4mm

B.5mm

C.6mm

D.8mm

A.20mm

B.25mm

C.30mm

D.35mm

A.50mm

B.60mm

C.70mm

D.80mm

A.5mm

B.4mm

C.3mm

D.2mm

A.100mm

B.150mm

C.200mm

D.250mm

A.69mm

B.68mm

C.67mm

D.80mm

A.中梁

B.侧梁

C.枕梁

D.横梁

A.30°

B.45°

C.60°

D.90°