多联机制冷剂管道连接时，分歧管是最常见的管路分支配件，在使用时，分歧管主管端口前应留

发布时间：2017-06-07 22:20 │ 来源：www.tikuol.com

题型：单项选择题

问题：

多联机制冷剂管道连接时，分歧管是最常见的管路分支配件，在使用时，分歧管主管端口前应留有不小于（）mm的直管段。

A、500

B、200

C、100

D、50

考点：土木建筑工程通风与空调工程通风与空调工程题库

题型：单项选择题

完型填空。

      Mrs. White 1 in a school. It is Sunday. She has 2 classes. At eight in the morning, she 3 to a shop
and buys a nice dress. She puts it in her bag and then buys 4 cakes for her children. At eleven she 5 home.
She wants to put on her new dress, but she 6 find her bag. She calls the shop assistant (售货员), "Hello, Mrs.
Black. This is Mrs. White. Can you help 7 find my bag?__8__in your shop."
     "Of course, Mrs. White," says the assistant. "We found three bags here. But which one is 9 ?"
     "I'm 10 ," says Mrs. White, "I can tell you which one is mine."

( ) 1. A. work
( ) 2. A. not
( ) 3. A. walks
( ) 4. A. a piece of
( ) 5. A. gets to
( ) 6. A. can
( ) 7. A. I
( ) 8. A. It's
( ) 9. A. you
( ) 10. A. go

B. works
B. any
B. go
B. a little
B. gets
B. don't
B. my
B. Its
B. your
B. come

C. working
C. some
C. walking
C. some
C. get
C. can't
C. mine
C. They're
C. mine
C. coming

D. study
D. no
D. walk
D. much
D. get to
D. isn't
D. me
D. He's
D. yours
D. came

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下列四组函数中，表示同一个函数的是（　　）

D．f（x）=x²-2x-1与g（t）=t²-2t-1

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小悦将额定电压相同的两只小灯泡L₁、L₂串联接在电源上，如图所示．闭合开关后发现L₁发出明亮的光，却看不到L₂发光，造成此现象的原因可能是 (　　)

A．L₂开路

B．L₁的电阻相对太小

C．L₂的额定功率相对太大

D．L₁的实际电压相对太小

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《中华人民共和国传染病防治法》明确规定的传染病防治方针是（）。

A.防治结合

B.预防为主

C.依靠科学

D.分类管理

E.控制为主

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题型：单项选择题

吃粮食易发胖，就餐时不要吃主食等。

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