(单选题)30: 完成下列反应方程式:3 Cu + 8 HNO3 (稀) === 3 Cu(NO3)2 + X(I) + 4 H2O4 Zn + 10 HNO3 (稀) === 4 Zn(NO3)2 + Y(II) + 5 H2O
A: (I) =NO, (II)= N2O;
B: (I) = NO, (II)= NO2;
C: (I) = NO, (II)= NO;
D: (I) = NO2, (II)= N2O
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