专利说明书的主要作用是公开技术信息和()
A、说明专利信息
B、限定专利权范围
C、确定专利效力
D、申请专利权
参考答案:B
网络发票云平台部署在()云计算中心
A.上海
B.广州
C.青岛
D.北京
Machines that use hydraulic pressure including elevators, dentist chairs, and automobile brakes.()
A. exclude
B. excluding
C. include
D. are included