For different kinds of needs, the weir of small over-flow structure can be designed as the composite weir with two or more types.
小型过水建筑物的堰型，因各种原因需要，可分段设计成两种或两种以上的混合堰型。
2
According to experience in Chekiang within the past seven years, it is clear that over-flow type fluidized bed furnace is a rational type for burning low calorific value and low grade stone coal.
A surplus allows snow to accumulate and for the pressure of snow accumulated over the years to transform buried snow into glacial ice with a depth great enough for the ice to flow.