齿轮工作的平稳性精度，就是规定齿轮在一转中，其瞬时（）的变化限制在一定的范围内。
A.传动比
B.转速
C.角速度
D.角速度、传动比
参考答案：A
Soon, more of the information we receive via the Internet could come (31) in digital wrappers. Wrappers are made up (32) software code that’s targeted to do specific things with the data (33) within them, such as helping to define queries for search engines. They also keep (34) from (35) access to that code.
A．package
B．packaged
C．packages
D．packaging
关于奇叶叙述不正确的是（）
A.只见于右肺上叶纵隔旁
B.没有独立的支气管
C.奇叶的叶间裂有四层胸膜
D.可以独立为一个肺叶
E.有由右肺尖走向右肺门上方的奇静脉
