单代号网络图与双代号网络图相比，说法正确的是( )。 A．由于工作的持续时间表示在

发布时间：2018-04-06 20:54 │ 来源：www.tikuol.com

题型：单项选择题

问题：

单代号网络图与双代号网络图相比，说法正确的是( )。

A．由于工作的持续时间表示在节点之中，没有长度，故不够形象直观
B．网络图不便于检查和修改
C．工作之间的逻辑关系容易表达，都用虚箭线，故绘图较简单
D．表示工作之间逻辑关系的箭线不可能产生较多的纵横交叉现象

考点：中级建筑经济建筑经济专业知识与实务

题型：单项选择题

下列说法正确的是（　　）

A．与元素的化学性质关系密切的是原子的最外层电子数

B．地壳中含量最多的非金属元素是硅

C．含氧元素的化合物一定是氧化物

D．海水中含量最多的元素是氢

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题型：单项选择题

     I took up skydiving in my twenties.At the time the accident happened, I'd done just 30 jumps.The
airfield was quiet when I __1__.On board were Chris, who was taking a tourist, and Ants, the
cameraman.Chris indicated I should exit first and the other three would __2__.Later I knew it was this
__3__ that saved my life.
     At 12,000 feet Chris rolled up the door and nodded that it was time for my exit.I put my foot on a
step just beside the door, and in a(n) __4__ the propeller blast (螺旋桨气流) threw me against the
__5__ of the plane, half in, half out.I pushed and got my other leg out of the door, but in doing so I
found myself __6__ the body of the plane towards the tail.My parachute (降落伞) got caught and my
__7__ and legs were pushed backwards, powerless, in the strong wind.
     I was strangely __8__.To a skydiver, being at 12,000 feet is a good thing.Altitude is your friend；
being close to the ground is deadly and will kill you.
     Ants appeared and __9__ slowly towards me, his legs held by Chris in the door.Ants reached out
and got hold of my foot.With the weight partly off, I found myself falling away from the plane, __10__
freed.I waved and smiled to indicate I was fine.
      It was actually very __11__.If any one of a number of factors had been different, I would have
__12__.I could have hit the plane with my head.If I had been the last to exit, the pilot alone would have
been unable to free me, and even if he had been aware that I was __13__ underneath the plane, he
would still have had to land at some point.
     Blue Skies, Black Death is the skydivers' mantra (咒语)．On the one hand, there's the freedom
and __14__ of the open sky.But in order to __15__this joy, you must accept that there is usually only
one result if something goes wrong.

( )1. A. jumped
( )2. A. follow
( )3. A. trouble
( )4. A. minute
( )5. A. left
( )6. A. sliding down
( )7. A. body
( )8. A. frightened
( )9. A. ran
( )10. A. really
( )11. A. funny
( )12. A. died
( )13. A. attached
( )14. A. pride
( )15. A. observe

B. arrived
B. escape
B. effort
B. way
B. right
B. knocking over
B. arms
B. anxious
B. moved
B. hopefully
B. ordinary
B. laughed
B. adjusted
B. confidence
B. experience

C. woke
C. leave
C. chance
C. instant
C. top
C. crashing into
C. head
C. excited
C. stepped
C. certainly
C. clear
C. stopped
C. covered
C. excitement
C. imagine

D. dove
D. fly
D. decision
D. sense
D. side
D. leaning against
D. fingers
D. calm
D. rushed
D. finally
D. serious
D. returned
D. connected
D. willingness
D. discover

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题型：单项选择题

磺脲类降糖药的适应证是：（）

A.饮食治疗未能控制的2型糖尿病轻、中度患者

B.1型糖尿病患者可与胰岛素合并使用

C.单纯治疗1型糖尿病

D.糖尿病患者进行大手术时

E.用于治疗酮症酸中毒

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题型：单项选择题

硝态氮肥有哪些共同特点？

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题型：单项选择题

社会有机体存在和发展的基础是（）

A、生产实践

B、劳动工具

C、语言

D、精神文明

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