N a system of locks in a canal 水闸系统
The relationship between the tonnage and area of inland vessels is needed to calculate the average lockage tonnage reasonably.
探讨内河运输船舶的吨位与面积之间的关系，将有助于合理有效地计算船闸的一次过闸平均吨位。
However, the auxiliary lock is not equipped with tow haulage equipment, so double lockage tows require special pull boat assistance.
但是，辅助船闸没有牵引设备，因此双闸拖轮需要有特殊的牵引船协助。
The utility model relates to a flow meter of novel, particularly for the measuring occasion of the lockage flow quantity of open canal.
本实用新型涉及到一种新型流量计，特别是用于明渠过闸流量的计量场合。
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