Obviously, such an action limits future options and is employed only as a last resort to regain pressure control of the wellbore.
很显然，这样的作用限制了将来的选择，也只有在最后重新赢得对井眼内压力控制时才使用。
The present paper presents the action needed, occupational exposure limits for control silicosis, and finally introduces the ILO/WHO International Program on Global Elimination of Silicosis.
本文就所需要采取的措施．职业接触限值陈述了目前国际上的趋势，最后介绍了ILO／WHO全球消除矽肺的国际规划。
The present paper presents the action needed, occupational exposure limits for control silicosis, and finally introduces the ILO/WHO International Program on Global Elimination of Silicosis.
本文就所需要采取的措施．职业接触限值陈述了目前国际上的趋势，最后介绍了ILO／WHO全球消除矽肺的国际规划。
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