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单项选择题

根据岩土的水理特性，砂土层与黏土层相比，其透水性弱。
A、正确
B、错误

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单项选择题Which description of the characteristics of unilocular adipose cells is correct?

A．Cells are small in size, often round or extruded into a polygonal shape.
B．The nucleus is round located on the side of the cell.
C．The cytoplasm is squeezed by many small lipid droplets to the periphery of the cell and becomes a thin layer encapsulated lipid droplets.
D．In HE stained specimens, the large lipid droplets are dissolved and the cells are vacuolated.

多项选择题琼脂的凝固能力除了和有关外,还与()等因素有关。A. 原料B. 纯度C. 高压灭菌温度和时间D. 培养基pH值