在组织天然气燃烧过程有两种基本方案：预混燃烧和扩散燃烧。（）
参考答案：对
一个数的最大因数是36，它有______个因数．一个数的最小倍数是15，它有______个因数．
—What ______ you ______ at 7: 00 yesterday ?
—I ______ some food . [ ]
A. did, do, make
B. are, doing, made
C. were, doing, was making
D. were, doing, make
