温度计属于（）安全附件。A、显示和显示控制类 B、超压泄放类 C、紧急切断类 D、安全联锁

下列物质中，属于氧化物的是（　　）

A．O₂

B．SO₂

C．HCl

D．NaOH

根据短文内容，从短文后的选项中选出能填入空白处的最佳答案。选项中有两个为多余选项

Millions of people all over the world use the word OK. In fact, some people say the world. OK means all right or acceptable it expresses agreement or approval.

___小题1:___ .Some people say it came from the Native American Indian tribe known as the Choctaw. The Choctaw word “oken” means the same as the American word “okay”. Experts say early explorers in the American West spoke the Choctaw language in the 19^th century.

But many people doubt this. Language expert Allen Walker Read wrote about the word OK in reports published in the 1960s. He said the word began being used in the 1830s. __小题2:___.Some foreign –born people wrote “all correct” as “o-l-l k-o-r-r-e-c-t”, and used the letters O.K. Other people say a railroad worker named Obadiah Kelly invented the word long ago. They said he put the first letters of his names--- O and K --- on each object people gave him to send on the train.

__小题3:_ The organization supported Martin Van Buren for president in 1840. They called their group the OK Club. The letters were taken from the name of the town where Martin Van Buren was born--- Old Kinderhook, New York.

Then there is the expression A-OK. It is a space-age expression. It was used in 1961 during the flight of astronaut Alan Shepard. He was the first American to be launched into space. His flight ended when his spacecraft landed in the ocean, as planned. Shepard reported, “Everything is A-OK.”__小题4:__ One story says it was first used during the early days of the telephone to tell an operator that a message had been received.

There are also funny ways to say okay. __小题5:__ .These expressions were first used in the 1930s. Today, a character on the American television series, “The Simpsons”, says it another way. He says okely-dokely.

A．Some people say okey-dokey or okey-doke.

B．Still others say a political organization invented the word.

C．Therefore, it has become popular in that area from then on.

D．But many experts don’t agree on what the expression means.E.     Language experts do not agree about where the word came from.

F.     It was a short way of writing a different spelling of the words “all correct”.

G.    However, some exerts say the expression did not begin with the space age.

IP电视系统有四个基本的组件，分别是网关、终端设备、多点控制单元和______。

A．路由器

B．交换机

C．网守

D．集线器

25岁初产妇，妊娠39周，宫缩较强，第二产程20分钟，总产程3小时，胎儿娩出后即开始有鲜红血流出，5分钟后胎盘自然娩出， * * 出血仍多，色鲜红，有血块，估计出血的可能原因是（）

A.宫缩乏力

B.胎盘残留

C.凝血功能障碍

D.血管损伤

E.宫颈裂伤

医疗机构开展放射诊疗工作，应当具备的条件说法不准确的是（）

A.具有经核准登记的医学影像科诊疗科目

B.具有符合国家相关标准和规定的放射诊疗场所和配套设施

C.具有质量控制与安全防护专（兼）职管理人员和管理制度，并配备必要的防护用品和监测仪器

D.产生放射性废气、废液、固体废物的，具有污染物排放处理能力和应急监测方案

E.具有放射事件应急处理预案