正常Spee曲线的深度为A.0mm B.0~2mm C.2~3mm D.3~4mm E.4~5mm

admin2020-12-24  19

问题 正常Spee曲线的深度为

选项 A.0mm
B.0~2mm
C.2~3mm
D.3~4mm
E.4~5mm

答案B

解析
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