Co-ordinate with various admin suppliers, sucher to collect, check and process payment, keep records of all payments.
协调管理各类后勤供应商，做好例如收集、核对、跟进付款流程、保管付款凭证等事宜。
On the basis of the analysis of the twisting vibration of rotary sucher-rod string, a formula of calculating every harmonic vibration eigenfrequency is presented.
在对旋转抽油杆柱的扭转振动分析的基础上，给出了各阶扭转振动固有特性参数的计算式。
On the basis of the analysis of the twisting vibration of rotary sucher-rod string, a formula of calculating every harmonic vibration eigenfrequency is presented.
在对旋转抽油杆柱的扭转振动分析的基础上，给出了各阶扭转振动固有特性参数的计算式。
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