【简答题】已知苯巴比妥的质量标准如下: 本品为 5- 乙基 -5- 苯基 -2,4,6 (1 H ,3 H ,5H) - 嘧啶三酮。按干燥品计算,含 C 12 H 12 N 2 O 3 不得少于 98.5 %。 【性状】 本品为白色有光泽的结晶性粉末;无臭,味微苦;饱和水溶液显酸性反应。 本品在乙醇或乙醚中溶解,在三氯甲烷中略溶,在水中极微溶解;在氢氧化钠或碳酸钠溶液中溶解。熔点本品的熔点(通则 0612 ...
【单选题】Kale is an English girl. She is in Class 2. Grade 1. She's Nuber 5. She's in Row 6. These are her Chinese books. They're on her desk. You cam see a pencil box on it. too. You can see two pens. an eras...