【简答题】(本小题满分14分) 设 是定义在 上的函数,用分点 将区间 任意划分成 个小区间,如果存在一个常数 ,使得和式 ( )恒成立,则称 为 上的有界变差函数. (1)函数 在 上是否为有界变差函数?请说明理由; (2)设函数 是 上的单调递减函数,证明: 为 上的有界变差函数; (3)若定义在 上的函数 满足:存在常数 ,使得对于任意的 、 时, .证明: 为 上的有界变差函数.
【单选题】下列选项中不属于 Python 特点的是 _________
【判断题】Usually we can learn from shipping marks the destination and weight of the goods in transit.
【单选题】中机型船的特点是:1、空载吃水差较小;2、重载吃水差较大;3、货舱舱容浪费较大
【单选题】下列选项中,不属于 Python特点的是
【单选题】From the last paragraph, we can learn that multitaskers usually________.
B.
go in for different tasks
C.
fail to react quickly to potential dangers
D.
refuse to explain the reasons for their behavior
【判断题】Usually we can learn from shipping marks the destination and weight of the goods in transit.
【单选题】We can learn from Paragraph 3 that deep venous thrombosis usually happens because _____.
A.
the economy class is not spacious enough
B.
there are too many economy-class passengers
C.
passengers are not allowed to walk during the flight
D.
the low pressure in the cabin prevents blood flowing smoothly
【单选题】中机型船的特点是( )I.空载吃水差较小;II.重载吃水差较大;III.货舱舱容浪费较大