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trapezoidal index profile dispersion-shifted single-mode fiber
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acme screw thread【机】;trapezoidal thread【机】
trapezoidal thread broaching tap
sheet with trapezoidal corrugations
trapezoidal wave
trapezoidal
trapezoidal pulse【电子】
keystone【电子】;keystone distortion【电子】;trapezoidal distortion【电子】
trapezoidal filter
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