- sigma notation
- 总和: sum; total; totality; tale; ...
- 符号: character; sign; symbol; mar ...
- 概念、量和符号: aerodynamics concepts quantities and symbols aircraft geometry
- 量和符号: aerodynamicsconcepts quantities and symbolspart aerodynamic terms in common use use
- 术语和符号: ball screws-: vocabulary and designation
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