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Many are justifiably mystified by the logic behind the latest round of US “reciprocal tariffs” (Opinion, April 8). The use of bilateral trade balances to calculate the relative tariff level ...
Yellow flakes in shiny light vector illustration. Bright dust sparkling on black wallpaper design. Christmas or holiday card decoration. White gray smooth grainy gradient background website header ...
In this paper, an off-axis four-mirror afocal optical structure with characteristics of large compression ratio and high stray light specification is optimized, satisfying the design requirements. The ...
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