单词：internal drop
internal drop的用法和样例：
例句
- They are commonly used where a minimum pressure drop is important.通常用在要求压降最小的应用场合。
- The inventory of solids in a fluidized bed can easily be found by pressure drop measurements across the bed.流化床内的固定藏量可以用测定床层的压降办法很容易地求得。
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