控制形式：标准常闭、常开、双作用。
Control type: normally closed, normally open, double acting.
非旋转式，双作用，双杆。
双作用式变量叶片泵是一种新型变量泵。
The double-acting variable-vane pump is a new type of variable pump.
气体管道增压泵有单作用泵和双作用泵。
Gas pipelines have a single role of booster pumps and pump dual role.
双作用动力单元中间阀块。
而双作用式泥浆泵每往复一次完成两次吸排水行动。
The double acting reciprocating mud pump one time every two suction drainage action.
目前使用广泛的双作用叶片泵存在着较大的能量浪费；
The double action vane pump using extensively at present has great energy waste;
更为重要的是本研究发现了多种因素间的双因素交互作用。
It is more important that the study shows that there are two factor interactions.
双代号网络图中，虚工作和实工作有着本质的区别，其主要作用是传递工作之间的逻辑关系。
In the activity-on-arrow network, there are essential differences between positive activity and dummy activity.
双代号网络图中，虚工作和实工作有着本质的区别，其主要作用是传递工作之间的逻辑关系。
In the activity-on-arrow network, there are essential differences between positive activity and dummy activity.
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