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??????????40J???????????????????????????1???????????????????0.54/3=0.18
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????????60???·??????????,?????????????60???·????????????3.45/3 = 1.15
??????????????????????,????????,10??????????????·?,???????????
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???????????60???·???????, ????34.44,???????????????????1.15????30,?????????34.5?????????????????????????,????????????????С????????(??????????????ò???1.15,??????????????????????????С??????????λ?y?????????)???ó????????????????????????,????????????.
????????????????????????,?????С??????0.8???? ??????????????ü???80%.
????????????????ó?????????20%????,????????????,?????????5%-10%???????????????????????????????????????á?
???????????????
40???????? 0.28
40????????0.18
40?·??? 0.75
60?????????0.48
60????????0.65
60?·??? 1.15
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