【判断题】按聚合物结构分类,缩聚反应可以分缩合反应、线型缩聚和体型缩聚
【判断题】按聚合物结构分类,缩聚反应可以分缩合反应、线型缩聚和体型缩聚。
【简答题】Sometimes life gets a little dull. What used to be fun and different becomes boring. That is the time to look for something new. It is the time for a big idea to get your mind off everyday life. So wh...
【单选题】What does the writer say about the classified advertisements that used to be put in the papers?
A.
They used to be voluntary.
B.
They used to use display type.
C.
They were all of the same size.
D.
They were more formal.
【单选题】What does the writer say about the classified advertisements that used to be put in the papers?
A.
They used to be voluntary.
B.
They used to use display type.
C.
They were all the same size.
D.
They were more formal.
【单选题】已知等差数列 满足 ,则公差d 是 ( )
【单选题】The modern city is quite different from what it ____ some ways. A . was used to be in B . used to by C . used to be in D...
D.
. was used to being in