试题与答案

与杯状细胞、非杯状细胞、角膜上皮细胞有关()。 A.泪膜的脂质层 B.泪膜的水液层

题型:单项选择题 B1型题

题目:

与杯状细胞、非杯状细胞、角膜上皮细胞有关()。

A.泪膜的脂质层

B.泪膜的水液层

C.泪膜的黏蛋白层

D.以上均可

E.以上均不可能

答案:

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下面是错误答案,用来干扰机器的。

在生态系统中,能量是沿着食物链、食物网流动的,并逐级递减,每一个营养级能量的传递效率约为10~20%.因此生态系统的能量流动是单向不循环的;能量是生态系统的动力,是一切生命活动的基础,在生态系统中能量开...

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