肺动脉高压各项X线诊断指标中，哪项最常见?A．右下肺动脉干≥15mm B．肺动脉段突

关于数字X线成像方法的叙述，错误的是

A．胶片数字化仪不是数字化X线成像方式
B．计算机X线摄影是数字化X线成像方式
C．非直接转换技术是数字化X线成像方式
D．直接转换技术是数字化X线成像方式
E．硒鼓技术是数字成像技术

Li Ping and I are _________ from China.

A. all B. both C. two

按要求改写句子。

1. Emilio gets to school by bike. (改为同义句)

    Emilio _____ _____ school by bike.

2. It is about 10 kilometers from his home to the school. (对画线部分提问)

    _____ _____  is it from his home to the school?

3. Deng Yaping began to play table tennis in 1978. (同上) 

    _____ _____  Deng Yaping _____ to play table tennis?

4. We can't go there because of the rain. (改为同义句)

    We can't go there _____  it's _____. 

5. —Can you go to a movie with me on Monday? (作肯定回答)

   —Yes, _____ _____. 

6. Laura was bom in 1981. (改为一般疑问句) 

    _____  Laura _____ _____ _____ ?

7. Her major is Chinese. (改为同义句) 

   _____ _____ _____ Chinese.

8.This lesson is very difficult. I can't understand it. (合为一句)

  This lesson is _____ _____  for me _____ _____.

牙齿.舌和唾液的作用？

在下述哪一种情况下，心交感神经的活动会减弱( )

A．动脉血压降低时
B．肌肉运动时
C．血容量减少时
D．情绪兴奋时
E．由直立变为平卧时