120 080 569.0 066.0 0060 000T 005.0 05.0 620 0260 0650 088.0 5640 06.0 0060 0210 950 0800 520 0600 020 0890 100.00.600 0.774 0.560 0.748 0.520 0.721 0.480 0.693 0.440 0.663 0.400 0.632 0.360 0.600 1.000 1.000 % 0.320 0.566 0.960 0.980 E 0.280 0.529 0.920 0.959 0.240 0.490 0.880 0.938 0.200 0.447 0.840 0.916 0.160 0.400 0.800 0.894 0.120 0.346 0.760 0.872 0.080 0.283 0.720 0.848 0.040 0.200 0.680 0.825 0.000 0.000 0.640 0.800 IB 2 IB IPi IPi/ IP0 △IP = IP i i- IPi+1 △IPi/ IP0 IB 2 IB IPi IPi/ IP0 △IP = IP i i- IPi+1 △IPi/ IP0 ∑（△IPi/ IP ）0 8