液压支架端面距不能过大,端面距不能大于()mm。
A、400
B、200
C、340
参考答案:C
How many ________ are there in the school?
A.librarys
B.classes
C.glass
D.grade
There is useful book and interesting magazine on the desk. They are my brother’s.
A.a, an, all
B.a, a, both
C.a, an, both
D.an, a ,all