上消化道出血时产生黑粪是由于每日出血量超过() A.50ml B.20ml C.40

题型:单项选择题

问题:

上消化道出血时产生黑粪是由于每日出血量超过()

A.50ml

B.20ml

C.40ml

D.30ml

E.100ml

考点:急诊科住院医师普通外科普通外科题库
题型:单项选择题

智利南部柴滕火山(42.0°S,72.4°W)某日喷出大量气体和火山石。智利军警已启动紧急行动预案,要求当地居民撤离。据此回答下列各题。

小题1:智利火山活动比较频繁的主要原因是                            

A.位于太平洋板块与美洲板块交界的消亡边界

B.位于太平洋板块与美洲板块交界的生长边界

C.位于美洲板块与南极洲板块交界的消亡边界

D.位于美洲板块与南极洲板块交界的生长边界小题2:此次火山喷发时,火山灰蔓延的方向是                              

A.向西北方向

B.向东南方向

C.向东北方向

D.向西南方向

题型:单项选择题

阅读理解。

     Laura Edmonds has a look of horror on her face as she turns to look out the airplane window.

     It's not the threat of terrorism that worries her, but rather the possibility of mechanical failure. She says

she imagines the plane plunging to the ground because the engines may fall off. So every few minutes she

glances out the window to make sure they're still attached.

     It is a fear that has gripped her for 18 years, since her wedding day. Since then she has tried drugs and

cocktails to make it through flights. But, she says, they've been no help in easing her anxiety.

     She has dragged her family on the train from Connecticut to Florida, insisted on long drives and tried to

avoid flying at all costs. Even when friends fly, Edmonds says she worries, counting the hours till they arrive

at their destination.

     It's been three years since Edmonds has stepped on a plane.

     Yet here she is now, 20,000 feet above the ground on board a turbo-prop that's enroute from New York's

LaGuardia Airport to Baltimore-Washington International Airport in Maryland. She is hoping this is the flight

that will overcome her fear.

     "I feel the seat. I feel the seat against my arm. I feel my hands," recites Edmonds, her eyes still closed.

     She is attempting to change her mind, one of several so-called "strengthening exercises" she recently

learned from a video course designed to overcome fear of flying. The idea is to focus on the moment, rather

than the abstract.

     Former Pan Am's (泛美航空公司) pilot Tom Bunn is president of the company that produced the videos

that instruct passengers in the basic mechanics of flying and teaches them to control their thoughts.

     Before boarding the U.S. Airways flight, Edmonds presents a letter from Bunn to the flight attendant

asking to speak with the captain. The pilot gladly obliges, telling her he's been flying for more than two decades

and assuring her, "You're going to be fine. We're going to take good care of you."

     When the flight attendant offers drinks, Edmonds places her cup of water on the tray table and studies it,

tangible evidence that the plane is barely shaking.

     "Ladies and gentlemen, we are approaching Baltimore," announces the flight attendant. Edmonds is relying

heavily on Bunn's coping strategies during the 90-minute flight. But she's coping. As the wheels touch down,

Edmonds' face lights up.

1. Laura Edmonds has a fear of flying because _____.

A. she once experienced a mechanical failure

B. a mechanical failure often appears in her mind

C. she is good at imagining a terrible situation

D. air crashes often happen in her hometown

2. The underlined word "gripped" in the third paragraph means _____.

A. seized firmly

B. hurt seriously

C. cheated simply

D. treated carefully

3. From this passage it can be inferred that _____.

A. every seat in planes is equipped with video

B. passengers on board always feel nervous

C. nervous passengers in flying can get help from Bunn's company

D. travel by train is safer than travel by plane

4. Laura's overcoming the fear of flying is mostly owed to _____.

A. airline's comfort

B. her counting the hours on board

C. a letter from Bunn

D. her defeating herself

题型:单项选择题

下列关于船舶沿岸雾航的说法中,何者正确()。

A.应尽可能使航线与岸线总趋势平行

B.主要使用雷达瞭望,目视瞭望是次要的

C.采用逐点航法能确保船舶航线安全

D.雾中航行,能否听到他船雾号,是判断是否存在航行危险的关键

题型:单项选择题

折射仪的光源可安装在仪器内也可()。

题型:单项选择题

期末财务人员按照会计核算要求要编制试算甲衡表,财务人员针对试算平衡表的作用展开了讨论,下列说法正确的有()。

A.甲说在试算平衡表上,如果实现了期初余额、本期发生额和期末余额三栏的平衡关系,就可以确定账户记录是完全正确的

B.乙说在试算平衡表上,即使实现了期初余额、本期发生额和期末余额三栏的平衡关系,仍然不能保证账户记录是完全正确的

C.丙说如果账户记录有错误,通过编制试算平衡表一定可以发现

D.丁说如果编制试算平衡表,发现不平衡,也不能确定账户记录有错误

更多题库