重复实验以确保可靠性
Repeated tests for reliability
区分精密度（重复读数的一致性）与准确度（与真实值的接近程度），正确使用有效数字和科学计数法，并选择和使用合适的测量仪器以尽量减小不确定度。
Distinguish between precision (consistency of repeated readings) and accuracy (closeness to true value), use significant figures and standard form correctly, and choose and use appropriate measuring instruments to minimise uncertainty
学习证据 / Evidence
- 能够用例子解释精密度与准确度的区别
- 能够把测量结果按适当的有效数字位数进行四舍五入
- 能够根据情境选择分度值合适的测量仪器（例如，量取5毫升液体时选用10毫升量筒，而不是1升的量杯）
- Explains the distinction between precision and accuracy with examples
- Rounds measurements to an appropriate number of significant figures
- Selects a measuring instrument with appropriate resolution for the context (e.g. choosing a 10 ml measuring cylinder rather than a 1-litre measuring jug for a 5 ml measurement)
评估问题 / Assessment
如果 {{name}} 把同一块石头称了五次，得到的结果非常接近但都略微偏高，他们能否解释“精确”和“准确”的区别，以及为什么重复多次并不总能解决这个问题？
If {{name}} weighed the same stone five times and got very similar answers but they were all slightly too high, could they explain the difference between being precise and being accurate — and why having lots of repeats doesn’t always fix the problem?