The oil companies are having a hard time extrating oil and gas from offshore fields.
石油公司现在很难从近海油田中获取石油和天然气。
You must use a gas having about 80 % of the higher range full scale value.
你必须使用一路气，满足满量程值80%的位置。
You must use a gas having about 80 % of the higher range full scale value.
你必须使用一路气，满足满量程值80%的位置。
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