问题
问答题
上述如何区别哪个是阴性阳性？
答案
参考答案：
先采用DDL反应鉴别，其中只有B阳性，A、C均阴性；再采用氯化汞反应区分A、C，A与氯化汞生成的复盐沉淀加热后可变成红色的氧化汞，而C的复盐沉淀加热后无变化。
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上述如何区别哪个是阴性阳性？
参考答案：
先采用DDL反应鉴别，其中只有B阳性，A、C均阴性；再采用氯化汞反应区分A、C，A与氯化汞生成的复盐沉淀加热后可变成红色的氧化汞，而C的复盐沉淀加热后无变化。
| 用方框中所给单词的适当形式填空，使短文完整正确。（每个单词限用一次） | |
had no 1 at all. So the father decided to call on a monk(修道士）to train 2 child. The monk said to the boy's father, "You should leave your son alone here. rii make him into a 3______________man within three months. However, you can't come to see him during this period.” Three months 4 the boy's father came. The monk arranged a boxing match 5 the child and an experienced boxer. Each time the fighter struck the boy, he fell down, but at once the boy6___________up, and each time he was knocked down again, then the boy stood up again. After several times, the monk asked, "What do you think of your child?" “7____________ashame（羞愧）!”the boy's father said.”I never thought he would be so easily knocked down.I needn't have him 8 here any longer.” “I am sorry 9 that's all you see. Don't you see that each time he fell down, he stood up again instead of 10____?That's the kind of courage you wanted him to have.” |