热污泥技术利用热化学作用,在()下,将有机物质转换。 A.厌氧环境 B.好氧环境 C 发布时间:2019-01-28 08:41 │ 来源:www.tikuol.com 题型:单项选择题 问题: 热污泥技术利用热化学作用,在()下,将有机物质转换。A.厌氧环境B.好氧环境C.缺氧环境D.常温
题型:单项选择题 一批灯泡400只,其中20 W、40 W、60 W的数目之比为4∶3∶1,现用分层抽样的方法产生一个容量为40的样本,三种灯泡依次抽取的个数为( ) A.20 ,10 , 10B.15 , 20 , 5C.20, 5, 15D.20, 15, 5 查看答案
题型:单项选择题 At discussion, Jack ____ an idea that they should bring down the price of the bicycles.A.came aboutB.came upC.came outD.came up with 查看答案
题型:单项选择题 ______, his mother has to take care of him at home.A.Being illB.His to be ill C.He is illD.He being ill 查看答案