【单选题】在施肥播种机上,排种器和排肥器的动力来源于( )。
【单选题】在高效液相色谱中,色谱柱的柱长度一般在( )范围内。
【单选题】Because of the economic slump, there are only ______ on the beach as before.
A.
one-fifth tourists as many
B.
one-fifth as many tourists
C.
tourists one-fifth as many
D.
tourists as one-fifth many
【单选题】of the students boys in our class. [ ]
【单选题】About_______ of the books in our school library________ written in English.
【单选题】在高效液相色谱中,用于分析的色谱柱长度一般在以下哪一范围内( )
【简答题】A.About one half. B.About one third. C.About one fourth. D.About one fifth.
【单选题】下列软件中,可以对图像进行处理的有( ).1美图秀秀 2Photoshop 3ACDSee 4ColdWrave