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In general, more testing adds to the costs. And lab-based testing may not be fast or agile enough to support border control officers, fraud investigators or food producers in the field.
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一块“钢”，可以“挑大梁”。在山东日照，一条产值2000亿元的钢铁产业链正加速向全球价值链高端攀升，科技这一“关键变量”成为当地钢铁产业高质量发展的“最大增量”。
Besides, US oil firms have been bitten by Venezuela once before. In 2007, major US companies including ExxonMobil and ConocoPhillips had their assets seized when they refused to allow PDVSA to take majority control.