The U. S. Air Force also will operate an F-35 variant, the a model, a conventional takeoff-and-landing fighter.

美国空军也将经营新的F - 35的变种A型，一种传统的起飞和着陆战斗机。

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A new finite element model based on U-bending benchmark of NUMISHEET '93 has been proposed to predict springback with contact evolution between the sheet and dies.

基于NUMISHEET93的U形弯曲标准考题，考虑板材与模具间的接触演变过程，建立了一个新的有限元模型来预测回弹。

youdao

A finite element model based U-bending benchmark of NUMISHEET '93 has been used to predict springback with contact evolution between the sheet and dies.

基于NUMISHEET93的U形弯曲标准考题，考虑板材与模具间的接触演变过程，建立了一个有限元模型来预测回弹。

youdao

Even if News Corp does start charging and others follow suit, analysts say doing a U-turn on the free news model will be hard to pull off.

BBC: Is free news a thing of the past?

They aim to transform the industry by reviving a business model--a steel mill that distributes its products--that failed in the U.S. two decades ago but still works overseas.

FORBES: Men of Steel

The oldest U.S.-sold model they found is a 1952 Strawberry Red 356 Cabriolet owned by Robert Wilson of Oklahoma City, Okla.

FORBES: In Photos: The Two Oldest Porsches in America