... appx 附录 apr tool 环空压控工具 apr 环空压力特性曲线 ...
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Cooperated with RD safety circulating valve, it can entirely take the place of APR-M2 tool with the character of accurate sampling, reducing construction period, simple and safe sampling etc.
与RD安全循环阀配合使用，完全可以替代APR-M_2工具，具有取样准确、缩短施工工期，取样过程简单、安全等特点。
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