Drag onto the page to add a checked, unchecked, or cross-marked check box to an interface.
拖到绘图页后，可以将选中的、取消选中的或划叉的复选框添加到界面上。
Drag to add an editable selection shape that can be configured as a check mark or a cross.
通过拖动可添加可配置为复选符或叉号的可编辑选择形状。
By simulation of the tractor in straight oil pipe with obstacle, discussed the working situation of components and the relation between drag force and the force need to cross obstacle.
通过直管障碍的仿真实验，得出了牵引器在直管中越障时各组件的工作状态、直管越障阻力与设计牵引力的比例关系。
By simulation of the tractor in straight oil pipe with obstacle, discussed the working situation of components and the relation between drag force and the force need to cross obstacle.
通过直管障碍的仿真实验，得出了牵引器在直管中越障时各组件的工作状态、直管越障阻力与设计牵引力的比例关系。
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