环己烷的分子式是()
A、C6H6
B、C6H12
C、C6H11OH
D、C6H10O
参考答案:B
For most people, life in __ Britain is very different to that lived by their grandparents.
A.remote
B.parallel
C.contemporary
D.temporary
在制作可卸代型的过程中,在模型底面涂一层凡士林的作用是()。
A.润滑
B.黏固
C.表面强化作用
D.分离作用
E.防水