抗菌药物主要作用机制包括 A．抑制细菌细胞壁合成 B．抑制细胞膜功能 C．抑制细菌D

The conclusion _____ the police came to _____ the boss was as much to blame as anyone else for the great fire didn’t satisfy everyone.

A．where / that

B．which / it

C．that / when

D．that / that

Mr. Black was old, but able to _______quickly to changes in technology. [      ]

A. reply    

B. apply    

C. contribute    

D. respond

质量是2g的子弹，以300m/s的速度水平射入厚度是5cm的木板（如图所示），射穿木板后的速度是100m/s．子弹在射穿木板的过程中所受的平均阻力是多大？

常用的铣削键槽方法有分层铣削法和一次铣准法。

处理反对意见时，需要通过强调产品的特色和优势来处理，不能抛开客户需求和产品优势泛泛说明。