在一定温度下，向a L密闭容器中加入1 mol X气体和2 mol Y气体，发生

下面不属于博客的基本特征的是（）

A.知识性

B.自主性

C.积极性

D.共享性

为满足工艺操作需要，煤气管道要有附属的动力设施和检测自控装置。（）

下肢静脉切开插管后1周，出现寒战、高热、静脉切开处伤口红肿，并有脓性分泌物，此时的处理原则应是( )

A．立即拔除导管

B．拆开缝线，保持切口引流通畅

C．取脓液进行细菌培养及药敏试验，使用抗生素

D．静脉内注入肝素以防血栓形成

E．保留导管，换药

[听力原文]6-7

M: Are you going to leave school at the end of the term

W: Yes, I am.

M: What are you going to do

W: I’m going to be a clerk.

M: What does a clerk do

W: She works in an office. She writes letters and reports, and she types.

M: I want to be a vet.

W: A veteran

M: No, vet — a veterinary surgeon.

W: My god! What’s that

M: A vet is someone who takes care of sick animals, like an animal doctor.

W: I once read a story about a person who talked to animals. It was very interesting.

What does the man want to become （）

A．A clerk.

B．An animal doctor.

C．A doctor.

D．A teacher.

喷头的性能和规格参数常有哪些？