假设某企业只生产销售一种产品，单价50元，边际贡献率40％，每年固定成本300万元，预计明年产销量20万件，则价格相对利润的敏感系数为( )。

多项选择题Which statements are NOT true? A、Miss Watson's aim in choosing a painting outside the syllabus is to show the grotesqueness of the painting. B、Miss Watson's aims in choosing a painting outside the syllabus is to encourage independent thinking. C、Miss Watson's aims in choosing a painting outside the syllabus is to accept critics' ideas. D、Miss Watson's aims in choosing a painting outside the syllabus is to invite comments from textbooks.

单项选择题钢轨伤损的定义是钢轨发生折断、裂纹、( )的各种状态。 A、钢轨变形和磨损影响钢轨使用 B、其他影响和限制钢轨使用性能 C、焊接缺陷和影响钢轨使用 D、以上都不对