为提高精加工的劳动生产率,最有效的途径是提高______。
A.进给量
B.背吃刀量
C.切削速度
D.刀具刃磨质量
参考答案:C
排序。
( ) But where's the post office?
( ) How can I get to the library?
( ) Go along the road and turn left. The library is on your left.
( ) Excuse me, can you tell me the way to the bank?
( ) You can take bus No. 23 in front of the library.
( 2 ) Let me see. It's near the post office.
( ) Oh, I see. Thank you a lot.
某城市为稳定冬季蔬菜的供应,计划在郊区兴建和扩建大型温室。根据对历史数据的调查,温室的建造面积和建造成本的关系见表4。
在5%的显著性水平下对建造面积和建造成本进行相关性检验。