为高空或海底作业提供氧气的物质是 A．KClO3 B．KMnO4 C．Na2O2

发布时间：2017-06-23 05:19 │ 来源：www.tikuol.com

题型：选择题

问题：

为高空或海底作业提供氧气的物质是

A．KClO₃

B．KMnO₄

C．Na₂O₂

D．H₂O

考点：单质铝铝盐（铝离子）氢氧化铝

题型：选择题

完形填空。

     Mr. John was at the window of a train in    1   . He was going to Washington, and now he was    2   .
The train began moving, and an old worker    3   the window. Mr. John shouted angrily at the    6   ,
" I gave you my luggage (行李) an hour ago,    5   you didn't put it in the train. Why isn't it here, and
where did you    6   it?" The old man smiled at Mr. John and said, "I looked    7   you here and there,
but I didn't    8   you. Your luggage isn't as foolish    9   you are. You are in the wrong    10   . This
one is going to New York."

( )1. A. the street
( )2. A. tired
( )3. A. came to
( )4. A. boy
( )5. A. so
( )6. A. lost
( )7. A. over
( )8. A. find
( )9. A. so
( )10. A. window

B. the station
B. busy
B. left
B. woman
B. and
B. put
B. at
B. look for
B. but
B. luggage

C. Washington
C. happy
C. opened
C. worker
C. or
C. found
C. for
C. find out
C. for
C. train

D. the factory
D. angry
D. closed
D. driver
D. but
D. forgot
D. after
D. bring
D. as
D. station

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题型：选择题

根据括号中的汉语意思完成下列各句。

1. Are you ready for_______ (英语课)?

2. It's____ (二月二十号).

3. This is____ (我的风筝).

4. (怎样) is the weather today?

5. It is____ (刮风的).

6. (不), it____ (不是).

7. This is____ (一本书).

8. Is it____(下雪的)?

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题型：选择题

从离地H高处自由下落小球a，同时在它正下方H处以速度v₀竖直上抛另一小球b，不计空气阻力，有 [ ]

A.若v₀＞，小球b在上升过程中与a球相遇

B.若v₀＜，小球b在下落过程中肯定与a球相遇

C.若v₀=，小球b和a不会在空中相遇

D.若v₀=，两球在空中相遇时b球速度为零

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题型：选择题

24h尿标本留取时为防尿变质应注意（）

A.容器的容量为1000ml

B.如混入粪便，可将尿液滤过后留取

C.应置于阴凉处

D.根据检查项目加入合适的防腐剂

E.存放容器应清洁，并加盖

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题型：选择题

文件设计主要确定哪些内容？

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