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3.??

a.?????????0.252?????12(?????????)

b.????????????????????????????????????????

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a.????1030??4???

b.??????460.1???0.5?0.5??????0.5?0.25?0.5?(0.5)o??

c.??????15?0.30.5??B(2)0.250.5?0.5??

d.????????????????1?1???????...

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