选择题：以下属于双轴滑膜关节的是

好大学下列属于“拿来主义”和“自主创新”相结合的科技发展模式的国家是（） 答案及解析。

好大学Writing：A statement goes that “only through mistakes can there be discovery or progress”. To what degree do you agree with this statement? Write an essay of about 400 words.In the first part of your essay you should state clearly your main argument, and in the second part you should support your argument with appropriate details. In the last part you should bring what you have written to a natural conclusion or make a summary.You should supply an appropriate title for your essay.Marks will be awarded for content, organization, grammar and appropriateness. Failure to follow the above instructions may result in a loss of marks.答案及解析。

好大学按新九分法计算烧伤面积躯干和会阴占全身面积的答案及解析。

好大学下列组合， 错误的是答案及解析。

好大学第一次科学革命的起点是（）答案及解析。