没有经过培训和缺乏经验的调查人员最适宜使用的随机抽样形式是()
A.简单随机抽样
B.等距随机抽样
C.分层随机抽样
D.整群随机抽样
参考答案:B
单词拼写(共10小题,每小题1.5分,满分15分)
小题1:This medicine will ___________ (治愈)you of your headache.
小题2:Don’t ___________ (暴露)yourself to the sun too long.
小题3:There are two new houses under ___________(建设)
小题4:He was ____________ (不愿意)to pay the fine.
小题5:To our ___________(高兴)our football team won.
小题6:These gates are always open for the ____________(方便) of visitors.
小题7:At the meeting ,he would __________ (阐明)his own views.
小题8:You can discover many types of wildlife in the ___________ (环境)of a traditional farm.
小题9:He looked at the gold with ____________(贪婪的)eyes.
小题10:Remember to put the waste into the ___________.(垃圾桶)
酶作为一种神奇的生物大分子,能催化多种化学反应,下列图中能正确反映温度对酶活性影响关系的是( )