机械性肠梗阻时出现阵发性腹绞痛的原因是()。
A.梗阻近端肠段膨胀
B.梗阻近端肠段强烈蠕动
C.梗阻肠壁神经丛受压
D.腹腔内渗液刺激
E.以上都不是
参考答案:E
Change the sentences into questions. (就画线部分提问)
例: She is doing the dishes
What is she doing?
1. His grandparents are sleeping.
2. Her uncle is writing a letter.
3. We are eating dinner.
4. They are listening to music.
一个咀嚼周期所需平均时间及其中咬合接触时间和正中合牙齿接触时间分别约为()
A.0.875秒,0.2秒,0.1~0.15秒
B.0.875秒,0.1~0.15秒,0.2秒
C.0.975秒,0.2秒,0.1~0.15秒
D.0.975秒,0.1~0.15秒,0.2秒
E.0.875秒,0.1秒,0.2~0.2秒