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Materials expand and contract with temperature changes. This general concept has been exploited for thousands of years, for instance, to ensure tight rivets in blacksmithing by shrink-fitting. For precision instruments, however, (i)_______materials are truly (ii)_______: hence the importance of Invar, an alloy notable for its (iii)_______expansion and contraction over a range of temperatures.
- Blank(i)
- dimensionally stable
- mechanically durable
- thermally conductive
- Blank(ii)
- unreliable
- paramount
- economical
- Blank(iii)
- resistance to
- alternation between
- toughness from
dimensionally stable , paramount , resistance to 显示答案
以上解析由 考满分老师提供。
