为什么涡喷发动机停车前需要一个冷车阶段() A.使润滑油接触的表面回至正常的工作温度

题型:单项选择题

问题:

为什么涡喷发动机停车前需要一个冷车阶段()

A.使润滑油接触的表面回至正常的工作温度

B.烧掉在燃油控制器上游过多的燃油

C.在涡轮机匣收缩之前,使涡轮转子冷却

D.避免发动机轴承咬死

考点:飞机维修执照考试飞机维修执照考试题库
题型:单项选择题

A student was going to spend his holiday in a cool mountain village. That evening he stayed at an inn (小旅馆) near the railway station (火车站). Before going to bed, he went to the boss of the inn and said, "Excuse me, sir. Will you please wake me up at a quarter to five tomorrow morning? I’ll take the five o’clock train."

"Oh, sorry, sir," the boss said in a hurry, "I’m afraid I can’t. I won’t be able to get up so early."

The student was disappointed (失望). When he began to return to his room, be stopped and asked, "Have you got an alarm-clock (闹钟)? Maybe it can help me."

"Wait a minute, then." The boss said and brought out an alarm-clock. "Here you are, sir."

"Thank you very much." The student said happily. But he found it was rusty (锈的) when he had a look at it. And it sometimes worked and sometimes didn’t. He asked, "Will it ring in time?"

"I don’t know, either." said the boss, "But it doesn’t matter. You just give it a good shake at a quarter to five. And it will ring on time."

小题1:   The student stayed at the inn because ____.

A.it was in the cool mountain village he was going to

B.the boss of the inn was kind to him

C.the boss could wake him up at the right time

D.it was near the railway station小题2: The student asked the boss to wake him up the next morning because ____.

A.the boss had the habit (习惯) of getting up early

B.the boss had promised (答应) to help him in every possible way (千方百计地)

C.he was afraid he would not wake up in time to catch the train

D.it would take him a long time to walk to the railway station小题3:  The train the student was going to take would start at ____ the next morning.

A.five o’clock

B.a quarter to five

C.half past four

D.a quarter to six小题4:  The student was disappointed because ____.

A.he had to buy an alarm-clock

B.the boss refused to wake him up

C.he would take another train

D.he had to go to the village on foot小题5:   From the story we know the ____.

A.clock would wake the student up in time

B.student certainly missed his train the next morning

C.alarm-clock was no use for the student

D.student had the alarm-clock repaired (修理)

题型:单项选择题

关于第二心音分裂的描述错误的是()。

A.生理性分裂在青少年中更多见

B.肺动脉高压时可出现通常分裂

C.固定分裂可见于房间隔缺损

D.反常分裂可见于完全性右束支传导阻滞

E.逆分裂可见于主动脉瓣狭窄

题型:单项选择题

墙壁上的壁虎,缓慢向上爬行,将壁虎看作一个整体,根据力的相互作用原理,使壁虎向上爬行的力的施力物体是 [ ]

A.壁虎

B.墙壁

C.地球

D.空气

题型:单项选择题

脊椎动物颈椎和荐椎的首次分化发生在()。

A.鱼类

B.两栖类

C.爬行类

D.鸟类

题型:单项选择题

形成空壳状的铸造桥体厚度一般为()。

A.0.5~0.9mm

B.1.0~1.5mm

C.1.6~1.9mm

D.2.0~2.5mm

E.2.6~3.0mm

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