【简答题】tRNA分子的二级结构中双螺旋区叫作(),不能配对的部分叫作(),大多数tRNA由()个臂和()个环组成。
【单选题】Why did the Careers Officer suggest Cathy’s mother seeing some relevant information on career training in another room?
A.
He wanted to talk to Cathy alone.
B.
He wanted her to have a better understanding of the nature of career training.
C.
He did not like Cathy’s mother.
D.
This was part of the routine of their work.
【简答题】用一台旧仪器测定溶液的吸光度6次,得标准偏差s 1 =0.055;再用一台性能稍好的新仪器测定4次,得标准偏差s 2 =0.022。 计算其方差F= ;查表得 F 表 =9.01 ,判断两种分析方法的精密度之间 显著性差异。(是否存在)
【单选题】我们实验中所使用的分光计,它是一种( )的仪器。
【单选题】2017 年上第一题: 下列哪一种活动重点不是发展幼儿的精细动作能力?
【单选题】访问交换机的方式有多种,配置一台新的交换机时如何进行访问?——