男，35岁，曾有结核病史，现有午后发热，夜间盗汗等，腰部疼痛，

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问题单项选择题

男，35岁，曾有结核病史，现有午后发热，夜间盗汗等，腰部疼痛，活动时加重，休息后减轻，结合图像，最可能的诊断是（）

A.骨巨细胞瘤

B.腰椎骨转移

C.腰椎退行性变

D.腰椎结核

E.多发性骨髓瘤

答案

参考答案：D

句型转换

句型转换。

1. A: The students cared about their exam results very much.

B: The students _________________________ their exam results.

2. A: We were late for the class because it rained.

B: We came to the class late __________________________ the rain.

3. A: However difficult the work is, he will finish it on time.

B: __________________________ difficult the work is, he will finish it on time.

4. A: Do you know the girl in our school, whose parents are English?

B: Do you know the girl in our school, the parents _________________________ are English?

5. A: He was always late for work and lost his job.

B: He was ___________________________ because he was always late.

选择题

如图所示，一个内壁光滑的圆锥筒，其轴线垂直于水平面，圆锥筒固定不动。有一质量为m的小球A紧贴着筒内壁在水平面内做匀速圆周运动，筒口半径和筒高分别为R和H，小球A所在的高度为筒高的一半。已知重力加速度为，则

A．小球A做匀速圆周运动的角速度

B．小球A受到重力、支持力和向心力三个力作用

C．小球A受到的合力大小为

D．小球A受到的合力方向垂直筒壁斜向上