50-80

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2.

The LME last week said the buyer had bought between 50% and 80% of the exchange 's copper .

LME 上周表示，一个买家购买了该交易所 50%-80%的铜。

chinese.wsj.com

3.

4.

Health standard for dust containing 50% ~ 80% free silica in the air of workplace

车间空气中含 50%~80%游离二氧化硅粉尘卫生标准

www.zftrans.com