In this book the writer gives us a(n) _____ picture of social history.
In this book the writer gives us a(n) \_\_\_\__ picture of social history.
精确
His decision was _____, since he could not see the action from where he was standing.
His decision was \_\_\_\__, since he could not see the action from where he was standing.
Practice 9 Generally, however, modern examinations are, written. (1) The written examination, where all students are tested on the same question, was probably not known until the nineteenth century. Perhaps it came into existence with the great increase
Practice 9 Generally, however, modern examinations are, written. (1) The written examination, where all students are tested on the same question, was probably not known until the nineteenth century.
如果用一把最小刻度是毫米的刻度尺量出某物理量的长度是764.5毫米，则这里的有效数字是____位，数值中的数字____是估计出来的，是不可靠数字．
如果用一把最小刻度是毫米的刻度尺量出某物理量的长度是764.5毫米，则这里的有效数字是\_\_\_\_位，数值中的数字\_\_\_\_是估计出来的，是不可靠数字．
用准确称量的NaCl配制1mol·L－1标准溶液，应选用的一组仪器是（ ）．
用准确称量的NaCl配制1mol·L－1标准溶液，应选用的一组仪器是（ ）．