为了确保轻、重石脑油的切割效果,应()。A.防止冲塔,以使塔板损坏 B.及时了解轻、 发布时间:2019-07-18 08:36 │ 来源:www.tikuol.com 题型:多项选择题 问题: 为了确保轻、重石脑油的切割效果,应()。A.防止冲塔,以使塔板损坏B.及时了解轻、重石脑油馏出口情况C.及时了解反应深度的变化情况D.及时了解原料油的性质
题型:多项选择题 根据句子意思,用括号中所给单词的适当形式填空。 1. Children should speak to old people _______ (polite). 2. Tree-planting Day is on the _______ (twelve) of March every year. 3. David took a lot of ______ (photo) in Mochou Lake Park last weekend. 4. The time is too short.It’s ______ (possible) for Daniel to finish this work. 5. Stephen spends about half an hour ____ (swim) every Saturday afternoon. 查看答案