初步评审主要是进行( )审查。
A.符合性
B.实质性
C.完整性
D.规范性
参考答案:A
---Were your parents at home last night?
---No. _______ of us went to my uncle’s birthday party.
A.None
B.Neither
C.All
D.Both
往复式活塞杆在制造中采用什么方法来提高耐磨性?