著名的发明家诺贝尔经过长期的研究与试验,终于发明了安全炸药──三硝酸甘油脂,三硝酸甘油脂的化学式为C 3 H 5 N 3 O 9 ,这种炸药发生爆炸的反应方程式为:4C 3 H 5 N 3 O 9 ═12CO 2 ↑+10H 2 O↑+6X↑+O 2 ↑ (1)X的化学式是______. (2)推断X的化学式的依据是______.
【简答题】用括号中单词的适当形式填空。 1. Don't talk so__ (loud)!The child is sleeping. 2. I think she is__ ___ (real)a good student. 3. I enjoy___ _ (listen) to classical music very much. 4. There are too many_____(rule) i...
【简答题】用括号中单词的适当形式填空。 1. Please be quick, or you (be)late for the meeting. 2. The bus (leave)when I got to the bus stop. 3. The dictionary must (take)good care of. 4. Either you or she ( have) made a wrong d...
【简答题】用括号中单词的适当形式填空。 1. Let's hope that all our trouble will (appear) soon. 2. The local people are ( thank) that the whole nation are helping them rebuild the town. 3. Lots of (foreign)come to visit the ol...