1、
The branchial filament clearly widen and whose holes become smaller and closely arranged.
鳃丝明显变宽,其两侧的鳃孔也变小,排列更紧密.
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2、
乐果和三唑磷对缢蛏鳃显微结构的影响是：鳃丝变短，鳃丝间隔和基底膜结缔组织增生，鳃孔、血管腔堵塞；
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