人教八上生物关节各部分分别具有什么作用?

209 2025-02-17 17:22

一、人教八上生物关节各部分分别具有什么作用?

关节的结构: 关节模式图中, 关节头放在关节窝中,使关节牢固,防止关节脱落。关节囊包在整个关节的外面加强关节的牢固;关节腔内有空隙和滑液,使关节灵活;关节面上的关节软骨可以减轻运动时的震动,减少摩擦,使运动灵活。

二、人教八上英语有什么好的配套资料?

人教版八年级上册英语的配套资料的话有练习册,还有英语周报,搭配这些资料一起复习的话,成绩一定可以提升。

三、人教八上英语第一单元日记作文?

Oct.1

Dear diary,

Today, my friend lives far away named xiao fang visited me.We really had fun together. In the morning,we went to Guangzhou museum and learned a lot about the history of Guangzhou province. In tha afternoon, we climbed Baiyun mountain. Later in the evening, we enjoyed ourselves while visiting the night safari. It's good to hang out with friends.

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