The chain pump is type of a water pump in which several circular discs are positioned on an endless chain. One part of the chain dips in to the water, and the chain runs through a tube, slightly bigger than the diameter of the discs.
例句与用法
1.
We had to move water by a chain pump because the electric pump had broken down . 抽水机坏了，只好用人工车水。
您当前位置：