环氧乙烷向水中排放,整个排放系统(管道,水槽等)必须A.密封 B.开放 C.半开放

题型:单项选择题

问题:

环氧乙烷向水中排放,整个排放系统(管道,水槽等)必须

A.密封

B.开放

C.半开放

D.插入下水道

E.以上都不是

考点:护理正副高医院感染护理学医院感染护理学3
题型:单项选择题

阅读理解。

      The British are famous as animal lovers, and in a nation of about 60 million people, there are about

 27 million pets! The most popular pets are dogs and cats.

      Many British people say that the main reason they have a pet is to keep them company (陪伴他们).

 According to a recent report, 60% of people who live on their own have a pet as company. A lot of

 pet owners treat their pet just like one of the family. Many cat owners make holes in their doors so

 their cats can come and go as they please. Dog owners spend a lot of time walking their dogs.

      Another reason to own a pet is for protection, especially dogs. Most thieves would think twice

 about breaking into (闯入) a house if they could hear a large dog barking inside. Some people choose

 their pets because of their beauty. The most beautiful animals can win prizes at pet shows!

      In the UK, some pet owners think that nothing is too good for their animal! Some people take their

 pet to the animal doctor more often than they visit their own doctor. They might even take a day off

 work to care for a pet when it is sick. Many people talk to their pets, and some talk to them over the

 telephone. And of course, they mustn't forget to celebrate the animal's birthday!

1. According to the passage, the number of the pets in the UK is _____ million.

A. more than 16

B. about 27

C. more than 36

D. about 60

2. The main reason the British have a pet is to _____.

A. win prizes at pet shows

B. protect the houses

C. keep them company

D. go for a walk with them

3. The underlined expression "think twice" in the passage probably means "_____" in Chinese.

A. 竭尽全力

B. 想方设法

C. 念念不忘

D. 三思而行

4. From the last paragraph we know that some pet owners in the UK think their pets are _____.

A. important

B. dangerous

C. successful

D. beautiful

题型:单项选择题
一个三棱锥的木块P-ABC,三条侧棱两两成40°,且侧棱长均为20cm,若一只蚂蚁从点A出发绕棱锥的侧面爬行,最后又回到点A,则其最短路径的长(  )
A.10
3
cm
B.20
3
cm
C.10(
3
+
7
)cm
D.10
7
cm
题型:单项选择题

车用汽油的抗爆性用()表示,柴油的抗爆性用()表示。

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简述普通机械化采煤的工艺过程。

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关于脐带内血管的描述哪项是正确的?()

A.有一条脐静脉和一条脐动脉

B.有两条脐静脉和一条脐动脉

C.有一条脐静脉和两条脐动脉

D.有两条脐静脉和两条脐动脉

E.无论有几条动静脉,脐静脉的血含氧低

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