若视频图像每帧的数据量为8.4 MB，帧速率为25帧/秒，则显示10 s的视频信息，

试述多发性肌炎的临床表现。

甲商品的价格（P）与数量（Q）之间存在如图所示关系。假设甲商品曲线D₃不变，当甲商品曲线从D₁移到D₂时，市场可能出现的情况有

A．甲商品供不应求，价格上涨

B．甲商品的替代产品供给增加

C．甲商品的互补商品需求减少

D．甲商品的替代商品需求减少

句型转换。

1. They are doing their homework now. (提问划线部分)

    _____ are they doing now?

2. Let's go to the Great Wall, _____ _____ (完成反意疑问句)

3. They had a math test last week. (用next替换last改写句子)

    We _____ _____ a math test next week.

4. She is babysitting her sister for vacation. (提问划线部分)

    _____ she _____ for vacation?

5. The boy is doing his homework after school. (提问划线部分)

    _____ _____ the boy _____ after school?

体位对疾病的诊断意义哪项正确

A．仰卧位见于胸膜炎
B．腹卧位见于急腹症
C．端坐位见于心肺功能不全 D．变换体位见于神经官能症
E．以上均不对