不定项选择

根据强化理论，只有积极强化的效果最好（）‍

A．错误
B．正确

你可能感兴趣的试题

单项选择题

设其中为任意常数，则下列向量组线性相关的是( ) A. B. C. D.

Exercise 2 China’s rail diplomacy
Directions: you will hear a piece of newsabout China’s rail diplomacy. Please supply the missing information of the newsreport.
Two examples of rail lines built by China
Example 1
Starting Time : December 19th
Project: A     1    linking the Thai capital city of       2     .
Significance:1 ) marking the beginning of bilateral cooperation to develop Thailand’s
first       3        double track railway line
2) part of the backbone of    4     transportation system
Length:      5

Example 2
Construction period：from December, 23rd to mid 2017.
Project: The Serbian section of the    6      line in the execution of a    7   between China and the two European countries.
Length : 350 kilometers
Convenience:It will reduce travel time between    8    to less than three hours from the current average of eight.

Goal
It’s aimed at     9     and a closer cooperation with partnercountries.

Efforts of Chinese leaders
Promoting China’s    10    and equipment during foreign visits or at   11   .
Example 1
In November this year, Chinese Premier Li Keqiang, regarded as a     12    for the country's railway industry, took leaders from 16      13  European, or CE countries for a   14   trip from Suzhou to Shanghai to   15   Chinese technology.
The twenty-minute trip, which came at the end of a   16   was dubbed as an   17   for China's     18    sector.
Example 2
Chinese President Xi Jinping also brought it up into the       19    Initiative in 2013. Since then, railway has become an      20     of China's diplomacy.

答案： (1)
railway line <...