带式输送机主要由皮带、上下托辊、电动机、滚筒组成。

单叶

Passage Translation 1Spending your vacation in a foreign country is horrible. First, you have to start early and become increasingly anxious with each passing day. When everything is OK and you really set off，you may find yourself in a car for hours. It is hot and you’re thirsty. And finally when you arrive at your destination, you’re in a strange place with strange people around. You’re confused and lost. You may be a little curious or a little excited, but as a matter of fact, very, very tired.

人们遭遇不良情绪时，正确的处理方式为（）

A.喝酒

B.吃大量的东西

C.压抑负性的情绪

D.和朋友倾诉

在“牙齿和口腔区域编码命名法”中，“30”表示（）

A.上颌牙列

B.下颌牙列

C.左下颌牙列

D.右下颌牙列

E.以上均不是

恶心与呕吐例：简要病史：患者，女性，25岁，恶心、呕吐伴上腹痛2天。