涡流发生器的主要作用是().A.减小由于超音速气流通过机翼部分引起的阻力 B.增加阻

题型:单项选择题

问题:

涡流发生器的主要作用是().

A.减小由于超音速气流通过机翼部分引起的阻力

B.增加阻力的分散并辅助副翼的高速效力

C.破坏机翼气流从而使得失速从翼根发展到翼尖

考点:民航飞行签派员考试飞行原理飞行原理题库
题型:单项选择题

Eight-year-old Jesse Arbogast was playing in the sea late one evening in July when a 7-foot bull shark attacked him and tore off his arm. Jesse’s uncle jumped into the sea and dragged the boy to shore. The boy was not breathing. His aunt gave him mouth-to-mouth resuscitation(人工呼吸) while his uncle rang the emergency services. Pretty soon, a helicopter arrived and flew the boy to hospital. It was a much quicker journey than the journey by road.

Jesse’s uncle, Vance Folsenzier, ran back into the sea and found the shark that had attacked his nephew. He picked the shark up and threw it onto the beach. A coastguard shot the fish four times and although this did not kill it, the shark’s jaws relaxed so that they could open them, and reach down into its stomach, and pull out the boys’ arm.

At the Baptist Hospital in Pensacola, Dr Ian Rogers spent eleven hours reattaching Jesse’s arm. “It was a complicated operation,” he said, “but we were lucky. If the arm hadn’t been recovered in time, we wouldn’t have been able to do the operation at all. What I mean is that if they hadn’t found the shark, we wouldn’t have had a chance.”

According to the local park ranger Jack Tomosvic, shark attacks are not that common. “Jesse was just unlucky,” he says, “evening is the shark’s feeding time. And Jesse was in an area without lifeguards. This would never have happened if he had been in an area where swimming is allowed.”

When reporters asked Jesse’s uncle how he had had the courage to fight against a shark, he replied, “I was mad and you do some strange things when you’re mad.”

小题1:What was the boy doing when the accident happened?

A.Feeding a hungry shark.

B.Jumping into the rough sea.

C.Dragging a boy to the shore.

D.Swimming in a dangerous area.小题2: In which way did the boy’s uncle help with the operation?

A.By finding his lost arm.

B.By making a phone call.

C.By flying him to hospital.

D.By blowing into his mouth.小题3:How was his uncle in time of danger?

A.Careful.

B.Brave.

C.Optimistic.

D.Patient.小题4:According to Jack Tomosvic, _______.

A.people are often attacked by sharks

B.sharks never attack people

C.Jesse was unlucky to have been attacked by a shark

D.Jesse was swimming in a safe area at the moment

题型:单项选择题

直丝弓矫治器与方丝弓矫治器相比说法错误的是()

A.弓丝上消除了第一序列弯曲

B.理论体系相同

C.弓丝上消除了第二序列弯曲

D.弓丝上减少了弯曲

E.不用完制弓丝

题型:单项选择题

男性,30岁,欲行外痔切除术入院。

术后4~5d可采用()。

A.少渣半流

B.普食

C.清流

D.流质

E.要素膳

题型:单项选择题

新生儿,男,生后4天。护士进行晨间护理时发现该儿皮肤、巩膜出现黄染,大便黄色糊状,但精神、食欲尚好。化验结果提示血清胆红素浓度202μmol/L,血常规无异常。查阅病历提示小儿血型为O型,其母为A型。

此时,应采取的最佳处理措施是()。

A.给予抗生素

B.立即蓝光照射

C.观察黄疸变化

D.给保肝药物

E.换血疗法

题型:单项选择题

镰刀型细胞贫血症的实例可以说明()

A.基因通过控制酶的合成来控制代谢过程,进而控制生物体的性状

B.DNA中某个碱基发生改变,生物体合成的蛋白质必然改变

C.基因通过控制激素的合成,控制生物体的性状

D.基因通过控制蛋白质的结构直接控制生物体的性状

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