试述红骨髓的分布。

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问题问答题简答题

试述红骨髓的分布。

答案

参考答案：

胎儿和幼儿的长骨骨髓腔和骨松质的腔隙内全是红骨髓。6岁以后，红骨髓仅存在于短骨、扁骨、不规则骨以及肱骨、股骨近侧端骨松质的腔隙内，终身保持其造血的功能。

改错题

短文改错

文中共有10处语言错误，每句中最多有两处。错误涉及一个单词的增加、删除或修改。

增加：在缺词处加一个漏字符号（∧），并在其下面写出该加的词。

删除：把多余的词作斜线（\）划掉。

修改：在错的词下划一横线，并在该词下面写出修改后的词。

注意：1．每处错误及其修改均仅限一词；

2．只允许修改10处，多者（从第11处起）不计分。

I first met Li Ming at a friend birthday party five years ago. Then I invited Li Ming over in my place.

We listen to my CDs together and soon become best friends. Three years ago, Li Ming's parents

invited I to spend two wonderful week in Qingdao with them during the summer holiday. Li Ming and I

loved

walking along the beautifully beaches there. Last year I was ill but had to stay in hospital for a week.

Li Ming came see me every day. Then his father has changed jobs and they moved to another city. Since

then we haven't see each other much. But we've kept writing to each other.

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判断题

解吸流程中的关键设备是解吸塔。