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Ax-3 astronauts will now leave ISS in SpaceX Dragon capsule Feb. 6 after delays. Here's how to watch live.

Ax-3 astronauts will now leave ISS in SpaceX Dragon capsule Feb. 6 after delays. Here's how to watch live.

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Ax-3 astronauts will now leave ISS in SpaceX Dragon capsule Feb. 6 after delays. Here's how to watch live.

钛合金为什么难加工？

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切削过程中产生的高温同时破坏了钛合金零件的表面完整性，导致零件几何精度下降和出现严重减少其疲劳强度的加工硬化现象。

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