As an example, the strength of a solid fuel rocket engine shell is calculated.

作为一个例子，计算了一个固体火箭发动机壳体的强度。

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Supposedly, it was developed by NASA as a solid rocket fuel.

据说，这种东西最早是由NASA作为固体火箭燃料而研发的。

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Supposedly, it was developed by NASA as a solid rocket fuel.

据说，这种东西最早是由NASA作为固体火箭燃料而研发的。

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