Based on the principle of mass balance, the Pseudo-Level Depth Finder can attain the true level by testing annular gas rate.

根据物质平衡方法设计的拟液面测试仪，可通过测试油井环空排气量来确定油井的真实液面。

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Firms will provide an additional level of depth to the analysis of consumer behaviour.

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But wearables are superficial by nature and cannot provide the level of in-depth data of embedded sensors being developed for the body.

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"Some of the best juniors are more than capable of competing at senior level, but the depth is just not there in the junior ranks, " he said.

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