为求出某气态化合物的LD50，选择小鼠采用静式吸入方式染毒，染毒柜容积为100L，每

发布时间：2017-09-10 14:27 │ 来源：www.tikuol.com

题型：单项选择题

问题：

为求出某气态化合物的LD₅₀，选择小鼠采用静式吸入方式染毒，染毒柜容积为100L，每只小鼠每小时最低需气量为3.45L，按接触2小时计算，每个染毒柜最多可放置的小鼠数为（）

A.14

B.18

C.22

D.26

E.30

考点：北京住院医师公共卫生学Ⅰ阶段卫生毒理学卫生毒理学题库

题型：单项选择题

完形填空。

     Last Sunday I saw the    1   storm in years. It came    2   and went on for more than three hours. After
lunch, I went into my room to have a rest. The air    3   hot and all was quiet.
     The strong wind started    4   into my room.    5    of paper on my desk flew high into the air and some
flew out of the open window. As I ran out to catch them, big    6   of rain began to fall.
     When I came back    7   the house, it was raining    8    . I tried to    9   the window. Then I heard a
loud crashing sound from the back of the house. I ran out of my room to find out    10   it was-a big tree
fell down and broke the top of the back room.

(     ) 1. A. bad
(    ) 2. A. suddenly
(   ) 3. A. is
(   ) 4. A. blow
(   ) 5. A. Piece
(    ) 6. A. drops
(   ) 7. A. in
(   ) 8. A. heavy
(   ) 9. A. close
(    ) 10. A. how

B. badly
B. sudden
B. was
B. blows
B. Paces
B. dropes
B. to
B. more hardly
B. open
B. what

C. worst
C. slow
C. are
C. blowing
C. Pieces
C. dropping
C. into
C. harder and harder
C. turn on
C. why

D. worse
D. easy
D. were
D. blew
D. Page
D. dropped
D. onto
D. hardly
D. turn off
D. when

查看答案

题型：单项选择题

采用煤柱支撑法管理顶板时，在顶板大面积悬空区内有很多小断层或基本定岩性突然变化的情况下会发生（）。

A、整体一次冒落

B、分层分次冒落

C、分阶段冒落

D、不冒落

查看答案

题型：单项选择题

发病率高，死亡率最高的时期是（）

A.胎儿期

B.幼儿期

C.青春期

D.婴儿期

E.新生儿期

查看答案

题型：单项选择题

膝关节三联损伤是指（）

A.内侧副韧带、外侧半月板及前交叉韧带损伤

B.外侧副韧带、内侧半月板及后交叉韧带损伤

C.内侧副韧带、内侧半月板及前交叉韧带损伤

D.内侧副韧带、内侧半月板及后交叉韧带损伤

E.外侧副韧带、内侧半月板及前交叉韧带损伤

查看答案

题型：单项选择题

行政复议决定书邮寄送达的，以什么时间为送达日期：

A．挂号回执上注明的收件日期

B．复议机关作出复议决定的日期

C．邮局寄出复议决定书邮件的邮戳日期

D．邮局接收复议决定书的邮戳日期

查看答案

更多题库