Rotary piston pump is a volume type vacuum pump and is applied widely, but there has been no method for exactly calculating dynamic balance of rotary piston up to the present.
滑阀真空泵是一种容积式真空泵，在各工业领域广泛应用。但该泵的旋转活塞平衡长期以来无精确计算方法。
The network service quality transmitting method enables the service quality transmitted by the network under the situation of no balance network technique.
采用该实现网络传输服务质量的方法，实现了网络技术不对称情况下的网络传输的服务质量。
The virtue of balance beam pumping unit is directly depended on its balanced state. But so far, there is no simple and efficient method to detect the balanced state.
游梁式抽油机的平衡状况直接关系到其效能，而对其平衡的检测目前尚无简单易行的办法。
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