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2.????3?????3????????????????????????
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a.?????????0.252?????12(?????????)
b.????????????????????????????????????????
4.?
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??????????1???????????????
e.?0.1???(25000)0.1?0.5?0.5???
5.?:
a. ????????????????
b.????(Buller)??????????????????????

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