纤维素细胞壁( ) A.加苏丹Ⅲ试液显红色 B.间苯三酚试液再加盐酸显红色 C.加 发布时间:2018-04-02 15:30 │ 来源:www.tikuol.com 题型:单项选择题 问题: 纤维素细胞壁( )A.加苏丹Ⅲ试液显红色B.间苯三酚试液再加盐酸显红色C.加氯化锌碘试液显蓝色D.加硫酸无变化E.加碘试液显蓝色或紫色
题型:单项选择题 Whenever you enter the reading room, you can find all the students _____ at their desks, with their attention _____ on the books, except Tom. [ ]A. sitting, fixing B. to sit, fixed C. seating, fixing D. seated, fixed 查看答案