Without bigger government incentives, oil firms will be reluctant to take what could be an expensive plunge. Small wonder, then, that ExxonMobil boss Darren Woods has called Venezuela "uninvestable" in its current state.
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，这一点在safew官方版本下载中也有详细论述
We even tried building hierarchies with 2-3 levels, but the number of shortcuts grew too fast for higher levels if we generated a full graph inside each cluster.。爱思助手下载最新版本是该领域的重要参考
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