加热下列各物质,不产生 NH 3 的是( ) A 、 NH 4 Cl B 、 (NH 4 ) 2 SO 4 C 、 (NH 4 ) 2 Cr 2 O 7 D 、 NH 4 HCO 3
A.
B.
C.
D.
D
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【简答题】Translation: Heaven knows it is difficult enough to say precisely what it is that a piece of music means, to say it definitely, to say it finally so that everyone is satisfied with your explanation.