Before starting test, all needle valves on test kit must be closed.
在开始检测前，检测组件上的所有针形阀都必须关闭。
All needle valves must be closed on test kit.
检测组件上的所有针形阀都必须关闭。
To test system functions, please open the valves and drain water out of them.
开启阀门排水来检验系统功能。
The test stand prepares the ground for a through investigation into drill pump valves.
试制的实验室用泵阀试验台为深入开展钻井泵泵阀的理论研究创造了条件。
The test stand prepares the ground for a through investigation into drill pump valves.
试制的实验室用泵阀试验台为深入开展钻井泵泵阀的理论研究创造了条件。
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