同时着重分析比较了用不同制备方法获得的BN 纳米管的端帽结构。

The tip structures of BN nanotubes produced by different technologies are compared and discussed.

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不幸的是，这种“座曲式”结构的键盘早就被“橡胶圆点”式键盘所取代了。后者的键帽下附有小按棒，按键被摁下时按棒就会触动分布在一层塑料薄膜上的橡胶圆点。

The buckling spring method, unfortunately, has long been replaced by the 'rubber dome,' where little sticks on the underside of the keys press down on rubber domes laid on a plastic underlay.

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分析了后减震器帽的成形工艺，介绍了成形该零件的拉深模、翻边模以及旋压模具结构。

The forming technology of rear shock absorber cap is analyzed, and its drawing die, flanging die and spinning die structure are also introduced.

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