对轻组分来说,精馏段是提高它的浓度,提留馏段是增大它的效率。
参考答案:对
印度半岛位于( )。
A.太平洋板块
B.印度洋板块
C.亚欧板块
D.非洲板块
词汇运用(每小题1分,共5分)
根据句意,用所给单词的适当形式填空。
小题1: My father and my uncles are all ___________ (policeman).
小题2: That is the ______ (begin) of the garden tour.
小题3: Are the doctors and nurses in the hospital ______ (friend) to you?
小题4: The koalas often sleep during the day and eat ______(leaf) at night.
小题5: Mary enjoys _________(watch) soccer games very much.