实验研究方法根据控制程度的不同可以分为()
A文献法与内容分析法B真实验与准实验
C.访谈法与问卷法
D.实验室观察与自然观察

By mentioning Bangladesh in the last paragraph, the author intends to______.A．state that many countries are making precaution for global warmingB．demonstrate that Bangladesh is one of the poorest countries in the worldC．argue that the U.S. has been behind many countries preparing for global warmingD．prove that it's very important to make adaptation to global warming 点击查看答案

交换机转发数据的三种方法是(。) 点击查看答案