搜题请搜索小程序“爱下问搜题”
问题 单项选择题

有关溶血性贫血的叙述，下列哪项是正确的（）

A.红细胞破坏过多

B.红细胞寿命期缩短

C.骨髓造血代偿功能大于正常6～8倍

D.有血管内溶血和血管外溶血

E.以上都是

答案

参考答案：E

改错题

单句改错

1. I had some trouble to finding Tom's house.

2. When did your father join in the party?

3. How are you getting on well with your classmates recently?

4. Mr Smith said that he would leave for Shanghai next Monday.

5. The speech that he made concerned the project upset me.

6. While Tom walking the dog in a street,he met an old friend.
查看答案
选择题
电气化铁路的输电线常用图所示的方式悬挂在钢缆上．钢缆的A端固定在电杆上，B端连接在滑轮组上．滑轮组由a、b、c三个滑轮构成，配重P由多个混凝土圆盘悬挂在一起组成，配重的总重为G，若不计摩擦和滑轮的重量，则以下说法中正确的是（　　）

A．a为动滑轮，B端钢缆受到滑轮组的拉力大小约为3G

B．a为动滑轮，B端钢缆受到滑轮组的拉力大小约为G

C．a、c为动滑轮，B端钢缆受到滑轮组的拉力大小约为3G

D．a、c为动滑轮，B端钢缆受到滑轮组的拉力大小约为G
查看答案