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I was ______________ whether I would succeed at that time.

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Oxygen is an ______________ gas.

Living comfortably is _____________________ for one’s life.

数控系统的软件故障的原因有哪些?

点的弧坐标对时间的导数是速度的代数值,点走过的路程对时间的导数是,点的位移对时间的导数是。

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