起动喷嘴通气（） A.不存在 B.由压气机出来的空气分出 C.由常压空气提供 D.仅

For years and years people have been saying that railways are dead. “We can do without railways,” people say—as if cars and planes have made railways unnecessary. We all keep hearing that trains are slow, lose money and are dying. But this is far from the truth. In these days of expensive oil, railways have become highly competitive with cars and planes. If you want to carry people or goods from place to place, they’re cheaper than planes. And they have much in common with planes. A plane goes in a straight line and so does a railway. What is more, a railway takes you from the heart of a city center. It doesn’t stop you as a car does on crowded roads. And no plane or car can ever carry as many goods as one train does.

Far from being dead, railways are much alive. Modern railway lines give you a comfortable journey. Where else can you eat well, sleep comfortably, feel safe and enjoy the scene while you are traveling at the same time? And we are only the beginning, for we have just entered the age of super-fast trains, which are traveling 150 miles an hour and more. Soon we will be wondering why we spent so much on highways and planes we can’t fly in because we don’t have enough money to buy the oil.

小题1:Some people think railways are dying because______.

A．planes and cars are expensive

B．oil is expensive today

C．trains are slow

D．railways look ugly小题2:The writer thinks that railways are much alive because___________.

A．they are cheaper and more convenient

B．there aren’t any planes or cars

C．we can have a comfortable journey

D．we feel dangerous on highways小题3:According to the writer, which of the following is NOT true?

A．It is cheaper to travel by train than by plane

B．The railway station is usually at the center of the city.

C．When you get off a plane you will find yourself right in the city center.

D．No car or plane can carry as many goods as a train.小题4: What does the underline word competitive prefer to?

A．参与性的

B．性价比高的

C．竞争性的

D．对比性的小题5: The best title for this passage may be __________.

A．Which is the Best, Train, Car or Plane?

B．Railways, not the End, but the Beginning

C．Trains are More Competitive than Cars or Planes

D．Oh, Super-fast Trains

如果配15个HS-DSCH，以及3条HS-SCCH，在CDM方式下最多支持（）个HSDPA用户。

影响采空区地表变形的因素的说法，正确的是（）。

A.矿层埋深越大、矿层厚度越大，地表变形值也越大

B.矿层倾角大时，地表水平移动值也增大

C.厚度和塑性大的软弱岩层，覆盖于硬脆的岩层上时，后者产生破坏会被前者缓冲或掩盖

D.地表第四纪堆积物越厚，地表变形值也增大，变形陡峭

PPD结果判断，以下哪项是正确的

A．硬结直径＞10mm为强阳性

B．硬结直径＞20mm为(十十)

C．除硬结外，有水疱或局部坏死为(十十十十)

D．硬结直径5～9mm为(一)

E．硬结直径10～19mm为(十)

某建筑企业承接了一座涉外五星级饭店的施工任务，公司设备部在进行前期可行性调研、技术经济论证后，购置了一批施工机械，有塔式起重机、施工电梯、混凝土输送泵、混凝土搅拌站、装载机等，验收合格后交付现场投入使用。根据以上背景，回答下列问题：

机械选型的原则是（）。

A.节能环保

B.技术上先进

C.经济上合理

D.效益上最大化

E.安全可靠