A.400 B.500 C.600 D.700
A.1000t或不足1000t B.700t或不足700t C.500t或不足500t D.300t或不足300t
A.1%B.2%C.5%D.10%
A.1.30 B.1.50 C.1.80 D.2.00
A.0.554 B.0.598 C.0.625 D.0.688