题目内容
为了解某校近视的发生率，调查者．计划从今校50个班巾，随机抽取5个班，然后调查这些班中的所有学生，这种抽样方法称为
查看答案
搜索结果不匹配？点我反馈
更多问题
正常成人QRS波群时间是（）
Last week, a group of us students, who are ready to leave the campus and face the real world, talked about an issue: What kind of jobs we should take, part-time (on-the-side) extemporaneous jobs or stable fulltime jobs Some think that the former best suit them while others maintain that the latter render them more benefits. What is your opinion Write an essay of about 400 words to state your opinion. In the first part of your writing 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, language and appropriateness. Failure to follow the above instructions may result in a loss of marks. Write your essay on ANSWER SHEET FOUR.
In this section you will hear everything ONCE ONLY. Listen carefully and then answer the questions that follow. Mark the correct answer to each question on your ANSWER SHEET. Questions 6 to 8 are based on the following news. At the end of the news item, you will be given 10 seconds to answer each question. Now listen to the news. According to the news, what caused the growth of the US economy about 200 years ago
龟甲（）
微信支付 
支付宝支付