民用航空客机的机舱,除了有正常的舱门和舷梯连接,供旅客上下飞机,一般还设有紧急出

题型:问答题

问题:

民用航空客机的机舱,除了有正常的舱门和舷梯连接,供旅客上下飞机,一般还设有紧急出口,发生意外情况的飞机在着陆后,打开紧急出口的舱门,会自动生成一个有气囊构成的斜面,机舱中的人可沿该斜面滑行到地面上来,若机舱离气囊底端的竖直高度为3.2m,气囊所构成的斜面长度为4.0m,人为与气囊之间的动摩擦因数为0.4,一个质量为60Kg的人滑至气囊底端时的速度有多大?(g=10m/s2

考点:匀变速直线运动的位移与速度的关系牛顿第二定律
题型:问答题

Have you ever been to London? How much do you know about London? Now let me tell you.

London has a population of about 7, 000, 000. From about the year 1800 to 1945, London was the biggest city in the world. But now many cities are even bigger than before.

London is famous for many things. Tourists come from all over the world to visit its famous buildings and listen to the famous clock, Big Ben.

Like many big cities, London has problems such as traffic and pollution, and they stop the city from developing. Every day about 1, 000, 000 people come and go by underground, but there are still too many cars and buses in the streets. So the air isn’t clean. However, it is cleaner than it was 100 years ago.

For me, the best things in London are the parks. There are five parks in the city centre. But my children’s favourite place is Hamleys, the biggest toy shop in the world.

小题1:Maybe London became the biggest city in the world in______.

A.1750

B.1850

C.1950

D.1980小题2:What does the underlined word “underground” mean?

A.Ship.

B.Car.

C.Subway.

D.Taxi.小题3:What are the best things in London for the writer?

A.Famous buildings.

B.Parks.

C.Cars and buses.

D.Toys.小题4:---What’s Hamleys in London according to the passage?  ---It’s a______.

A.toy shop

B.museum

C.park

D.clock小题5:Which of the following sentences is NOT TRUE? ________.

A.London has a population of about 7, 000, 000

B.London is famous for buildings and Big Ben

C.The traffic in the city is easy because of the underground

D.The air in London is cleaner than 100 years ago

题型:问答题

安全生活离不开化学.下列说法错误的是(  )

A.工业酒精中含有甲醇等有害物质,不能饮用

B.工业用盐亚硝酸钠对人体有害,不能用于烹饪

C.进入久未开启的菜窖、干涸的深井和深洞前,要做灯火实验

D.发现煤气泄漏,应立即打开排气扇电源开关进行排气

题型:问答题

下列方剂组成中不含有当归的是()

A.定喘汤

B.暖肝煎

C.温经汤

D.苏子降气汤

E.真人养脏汤

题型:问答题

下列哪项处理恰当

A.肿瘤切除术后化疗

B.肿瘤切除术后放疗

C.双侧附件切除术后放疗

D.全子宫及双附件切除术

E.卵巢肿瘤剔除术术后放疗

题型:问答题

发放贷款是商业银行负债业务中最主要的业务。()

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