煤灰的熔融性对燃烧有何影响？
参考答案：
会堵塞炉篦和符着于传热面上，影响通风和传热使燃烧恶化，严重时烧篦和威胁锅炉的正常运行。
32. 一William has asked me to lend him five pounds．Should I do him the favor and lend it to him?
—Certainly，otherwise he________to borrow it from me．
A．would try
B．should have tried
C．would have tried
D．had tried
木工做一只棱长是5分米的正方体无盖木箱至少用多少木板？
