Through modification of the framework of a beam pumping unit by removing the cross tension link, a great quantity of steel can be saved and the manufacturing cost can be reduced.
采取去掉横拉筋的办法改造抽油机游梁支架，可节省大量钢材，降低制造成本。对改造后的游梁支架进行了动态应力测试、位移测试和稳定性计算。
Under the cushions can buy toilet paper volumes, do not have to move back or bottom mattresses, can be used at any time pumping, can effectively prevent cross-infection at the clinic.
座垫底下可置卫生纸卷，不必移动背板或底部床垫，即可随时抽用，能有效防止门诊时的交互感染。
Under the cushions can buy toilet paper volumes, do not have to move back or bottom mattresses, can be used at any time pumping, can effectively prevent cross-infection at the clinic.
座垫底下可置卫生纸卷，不必移动背板或底部床垫，即可随时抽用，能有效防止门诊时的交互感染。
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