题干
.(江苏卷28). The retired man donated most of his savings to the school damaged by the earthquake in Yushu,
________ the students to return to their classrooms.
A：enabling
B：having enabled
C：to enable
D：to have enabled
答案(点此获取答案解析）
A
2Z(g) + R(g)，反应平衡时，则知X
和Y 的转化率分别为30%和60%，则化学方程式中的n 值为 （ ）