fuel feed hole ; oil supply hole
进油孔口 oil inlet port
充油进口孔 charge oil inlet port
油进口/出口孔 oil inlet/outlet port
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抽油杆与控制器组成的控制杆柱下入到丢手管柱内，控制杆柱上部与杆式泵的进油孔相连。
The control rod string which is consisted of pumping rod and controller is tripped into the release string.
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