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翻译下面句子Heating it to a certain temperature and then quickly cooling in water may harden high carbon steel.

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翻译The more carbon the steel contains and the quicker the cooling is, the harder it becomes.

翻译Because of its high strength and hardness this grade of steel may be used for tools and working parts of machines.

翻译But for some special uses, for examples, for gears, bearings, springs, shafts and wire, carbon steels cannot be always used because they have no properties needed for these parts.

如果你得到两张免费的奥运会参观券，它们可以看作是自由取用物。

A. 对
B. 错