建设单位应当自领取施工许可证之日起()个月内开工。因故不能按期开工的,应当向发证机关申请延期。
A.建设准备
B.施工安装
C.生产准备
D.竣工验收
参考答案:C
As the noises are ________ of big cities, some people prefer to live in the countryside. [ ]
A. characteristic
B. particular
C. familiar
D. special
造成齿轮齿面胶合原因是什么?