A.2Na₂¹⁸O₂+2H₂O4Na¹⁸OH+O₂↑

B.2KMnO₄+5H₂¹⁸O₂+3H₂SO₄K₂SO₄+2MnSO₄+5¹⁸O₂↑+8H₂O

C.CH₃COOH+C₂H₅¹⁸OHCH₃COOC₂H₅+H₂¹⁸O

D.5¹⁵NH₄NO₃4N₂↑+2H¹⁵NO₃+9H₂O

A.2Na₂¹⁸O₂+2H₂O4Na¹⁸OH+O₂↑

B.2KMnO₄+5H₂¹⁸O₂+3H₂SO₄K₂SO₄+2MnSO₄+5¹⁸O₂↑+8H₂O

C.CH₃COOH+C₂H₅¹⁸OHCH₃COOC₂H₅+H₂¹⁸O

D.5NH₄¹⁵NO₃4N₂↑+2H¹⁵NO₃+9H₂O

科学家用同位素示踪法进行反应机理研究，下列反应或转化中同位素示踪正确的是

A．2Na₂¹⁸O₂ + 2H_­2O = 4Na¹⁸OH + O₂↑

B．2CH₃CH₂¹⁸OH + O₂→2CH₃CH¹⁸O + 2H₂O

C．CH₃COOH + C_­2H₅¹⁸OH→CH₃COOC₂H₅ + H₂¹⁸O

D．KClO₃ + 6H³⁷Cl = KCl + 3³⁷Cl₂↑+ 3H₂O