题目内容
为什么曾经有一段时期可以使用鲸鱼的牙齿作为货币？
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如果某人在树下埋了一罐货币，那么货币的职能是________。
Diesel engines are started by supplying_____into the cylinders in the appropriate sequence
One of the most common causes of reduction gear failure is gear wear caused by scoring as
The correct tightening is obtained by the use of______to measure the extension given to the bolts.
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