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单项选择题
The ultrastructure of thyroid follicular epithelial cells does not include
A．microvilli on the free surface
B．a relatively developed rough endoplasmic reticulum in the cytoplasm
C． a relatively developed smooth endoplasmic reticulum in the cytoplasm
D．secretory particles or colloidal vesicles on the top of cells
B．a relatively developed rough endoplasmic reticulum in the cytoplasm
C． a relatively developed smooth endoplasmic reticulum in the cytoplasm
D．secretory particles or colloidal vesicles on the top of cells
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