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area of passage (如阀门) | |||
active section | |||
useful cross section | |||
clear opening | |||
effective cross-section | |||
free area | |||
effective crossover | |||
area of passage | |||
clear opening (涵管等); net section; useful cross-section; working section | |||
clear area; effective cross section; effective section | |||
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cross-section | |||
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effective crossover | |||
| |||
clear area | |||
effective cross-section | |||
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clear area | |||
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clear opening |
有效截面 : 66 phrases in 17 subjects |