There are two valves on the rod pump, which are（ ）.
A、travelingvalve
B、gasliftvalve
C、operatingvalve
D、standingvalve
发布时间：2025-12-19 23:50:22
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答案：traveling valve ■standing valve
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- 2.rod rod
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- 6.connecting Rod
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- 8.fishing rod
- 9.When the hydraulic transmission system need high pressure,which pump will be selected。（ ）
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