elliptical opening 中文意思是什麼
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Weighted function method for a crack opening displacement of an elliptical crack
橢圓裂紋張開位移權函數法 -
The elliptical secondary should appear round and well centered in the circular opening of the sight tube
橢圓形的副鏡應看上去邊緣是圓的,在光管開口處呈現環狀。
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