There are several stoves in my job. I take some different metal objects and put them in a stove. When they have become very hot, I put these metal objects in a water. They are becoming harder that the

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There are several stoves in my job. I take some different metal objects and put them in a stove. When they have become very hot, I put these metal objects in a water. They are becoming harder that they were.

2021年5月27日 13:53

修改 · 1

There are several stoves in my job. I take some different metal objects and put them in a stove, when they become very hot, I put these metal objects in water. They become harder than before.

2021年5月27日

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