沼气发酵原料的最适宜的碳氮化为()。A.20-30:1 B.20:1以下 C.3 发布时间:2017-10-21 06:30 │ 来源:www.tikuol.com 题型:单项选择题 问题: 沼气发酵原料的最适宜的碳氮化为()。A.20-30:1 B.20:1以下 C.30:1以上
题型:单项选择题 ________ your major, you'll have to take general education classes in your first two years of college.[ ]A. In spite B. No matterC. Regardless of D. With regard to 查看答案