皮皮学，免费搜题
登录
搜题
【单选题】
为比较A.B两种药物对治疗婴儿肺炎的疗效,某医生考虑到病情轻重对疗效的影响,要求A.B药应用者中必须有不同病情者,且比例相同并以入院日期用A药,用B药,问A.B两药的疗效有无差别,该研究属于哪种设计A.
完全随机
B.
配对设计
C.
配伍组设计
D.
干预试验
手机使用
分享
复制链接
新浪微博
分享QQ
微信扫一扫
反馈参考答案：
举一反三
【简答题】It was ______ I met Mr. Smith in London. A) many years that B) for many years since C) since many years ago when D) many years ago that
【简答题】5只青蛙跳远比赛，根据它们的成绩排出名次 序号 成绩 名次 1号 0.9米 2号 0.8米 3号 1.1米 4号 1.2米 5号 0.85米
【单选题】13 These paintings are considered by many to be authentic.
A.
faithful
B.
royal
C.
genuine
D.
sincere
【单选题】Every day, many people come to visit the ______ of the old castle.
A.
location
B.
highland
C.
site
D.
desert
【单选题】Lili si making ___ with his spoken English.
A.
a good progress
B.
a rapid progress
C.
many progress
D.
fast progress
【单选题】Many young people find it harder to appreciate __________ music than pop music.
A.
simple
B.
light
C.
ancient
D.
classical
【单选题】When different cultures, we often pay attention only to the differerices without noticing the many similarities. [ ]
A.
compared
B.
being compared
C.
comparing
D.
having compared
相关题目：
参考解析：
知识点：
题目纠错 0
发布
