【单选题】There was a big fire in that building yesterday. Fortunately, all the people____out.
【单选题】There____ (be)no one here a moment ago.
【判断题】抽样误差只能指代表性误差中的偶然性代表性误差。()
【简答题】He is now accustomed to (walk) __________ to work everyday.
【多选题】实验动物的管理应当符合():
A.
当关注动物福利,遵循“减少、替代和优化”的原则
C.
新进入设施的实验动物应当进行隔离和检疫,以确认其健康状况满足研究的要求
D.
研究过程中实验动物如出现患病等情况,应当予以淘汰,防止影响实验结果