题目

 Mr. Green stood up in defence of the 16-year old boy，_________ that he was not the one ____________. A. said; blamed     B. saying; to blame    C. to say; to be blamed  D. saying; blaming 答案：B著名科学家诺贝尔经过长期试验，研制出安全炸药．炸药三硝酸甘油酯（C3H5N3O9）发生爆炸的化学方程式为：4C3H5N3O912CO2↑+10H2O↑+6X↑+O2↑（1）推断X的化学式为______．（2）若生成13.2g二氧化碳，则同时生成氧气的质量是多少？