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【单选题】
某温度下,一容器中含有2.0mol O2,3.0mol N2及1.0mol Ar。如果混合气体的总压为a kPa,则p(O2)=
A.
a／3 kPa
B.
a／4 kPa
C.
a／2 kPa
D.
a／6 kPa
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