逆流式机械通风冷却塔中,空气与水在填料层中反复与()接触,以进行换热。A.水膜 B. 发布时间:2019-10-09 15:25 │ 来源:www.tikuol.com 题型:多项选择题 问题: 逆流式机械通风冷却塔中,空气与水在填料层中反复与()接触,以进行换热。A.水膜B.水柱C.填料间水滴D.飞溅水滴
题型:多项选择题 While the total number of farmers engaged in agricultural production is barely half ______ it used to be in 1959, the size of the average farm has tripled.A.thatB.whatC.whichD.how 查看答案