无论是挂板还是沉积物，靠近虾池排水口的水域沙筛贝附着密度较低，而远离虾池排水口的水域沙筛贝附着密度较高。
The density of Mytilopsis sallei near outfall of shrimp pond was higher than that far from outfall of shrimp pond both on panel and in sediment.
使用时水从轻质挡风板下面的过水口通过，起到隔断风流让水流通过的作用。
When in use, water passes through the water opening below the light wind screen, thereby providing function of blocking air and passing water.
一种用在滑动水口中的抗裂纹阀板组件。
A crack resistant valve plate assembly is provided for use in a slide gate valve.
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