化合物A()与立方烷()的分子结构相似,如下图:则C4Si4H8的二氯代物的同分异构体数目为
A.3
B.4
C.5
D.6
答案:B
混凝土拌和物的坍落度主要用来评价混凝土的()。
A.含气量
B.流动性
C.黏聚性
D.保水性
A.Language and thought definitely influence each other.
B.It is impossible to understand the relationship between the two.
C.What we think certainly determines what we say.
D.What we say very probably affects what we think.