【简答题】圆柱截交线有三种情况:分别会有( )、( )、和两条互相平行的( )
【多选题】关于系统误差说法正确的有( )。
B.
系统误差的符号和大小都是确定的,或者具有一定的规律
C.
系统误差可以通过观测方法或改正方法加以消除或减弱
D.
系统误差对观测成果影响较小,观测过程中可以不予处理
【单选题】某乡有人口2万人约5000户,欲以户为单位抽其中2000人进行某病的调查若按该乡家庭人口登记名册,随机抽取第1户,随后每间隔几户,再抽取,对被抽到的家庭进行调查。这种抽样方法称为()
【单选题】听力原文:W: Hello Jack! You don't look well, and what seems to be the problem? M: Actually it is big suffering for me. Every year almost this time, I must come down with something. W: What are symptoms do...
C.
Working with patients.
【判断题】The young man says while he opens the suitcase. 在这句话中,opens the suitcase指的是保存好票卡。
【判断题】The young man says while he opens the suitcase. 在这句话中,opens the suitcase指的是在你的手提箱中。
【单选题】听力原文:W: Why don't you get a good job for a change? M: But I like my job. W: Look, digging gardens is not a job for a university graduate. M: But the money's not bad and there's, plenty of fresh air. W...
【单选题】He opens the shipment, only to find that the products were poor quality.
【单选题】环境创设中,幼儿与教师共同合作,共同参与,符合幼儿环境创设的( )原则。