CRH1的车体为（)焊接结构。A.不锈钢B.铝合金C.不锈钢和铝合金D.不锈钢和铸钢

A.1 950 mm

B.2 000 mm

C.2 050 mm

D.2 100 mm

A.2 250 mm

B.2 300 mm

C.2 350 mm

D.2 400 mm

A.1 700 mm

B.1 750 mm

C.1 800 mm

D.1 850 mm

A.5%

B.10%

C.15%

D.20%