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1·They commonly use the metric prefixes of Table 1-1 to express large or small quantities of space or time.

他们通常使用表1 - 1中所列的词头去表示空间或时间量的大或小。

2·Extended features include a list of 23 fundamental constants, illustration of the activity series of metals, metric system prefixes and a historical summary of superconducting materials.

扩展功能包括了23基本常数，对金属系列活动，公制前缀和超导材料的历史概况说明清单。