- active grate area
- open grate area
- 排: arrange; put in order
- 有效: effective; valid; efficaciou ...
- 面积: area
- 有效面积: active area; available area; capture area; clear area; clear opening; effective area; operating area; presented area; significant surface; strand area; useful area; valid surface
- 瓣膜有效面积: effective valve area
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