下列结构不是由一层上皮细胞构成的是_刷题宝

题干

下列结构不是由一层上皮细胞构成的是（　　）

A：小肠绒毛壁

B：皮肤的表皮

C：肺泡壁

D：毛细血管壁

上一题下一题 0.0难度选择题更新时间:2018-07-05 05:33:04

答案(点此获取答案解析）

B

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如图所示，某段滑雪雪道倾角为30°，总质量为m（包括雪具在内）的滑雪运动员从距底端高为h处的雪道上由静止开始匀加速下滑，加速度为

\frac{1}{3}

g．在他从上向下滑到底端的过程中，下列说法正确的是（　　）

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A. What do you think of Beijing?
B. I'll bring them to school tomorrow.
C. It was great.
D. Did you see any popular stars?

A: How was your vacation, LiLei?
B: ____ I went to Beijing with my parents.
A: Cool! Where did you go in Beijing?
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A:____
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我们能够感知世界万物的美好，既能欣赏大自然中各种美妙的风景，又能欣赏美妙悦耳的音乐，从而给我们们的身心带来愉悦感，所有这些都是靠我们的感觉器官。下面是人体的神经系统及感觉器官的部分结构示意图，请据图回答下列问题。

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