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皮肤软组织扩张器分几类?目前常用的是哪一类?其结构如何?

答案

参考答案：

分两类，即可控型扩张器和自行膨胀型扩张器。目前应用较为广泛的是可控型扩张器。它由三部分构成：扩张囊、注射壶和连接导管。

单项选择题

第1篇 Road Trip Vacations


It’s summer. In the United States, it’s the season of swimming pools, barbeques, camping and road trips.
Road trip vacations where the car journey is part of the fun are especially popular with college students, who like to explore the country on wheels. These budget trips are ideal for students who often have plenty of free time but little money.
"Ever since I went to college, I’ve been traveling around a lot, exploring the country," said Austin Hawkins, a 19-year-old college student from New York. This summer, Hawkins and his friends have spent weekends traveling in New England.
The best part about car trips, said Hawkins, is that you can be spontaneous. "On a road trip, if you get interested in things you see along the way you can stop and explore. "
Matt Roberts, a 20-year-old student from Ohio who drove to Montreal, Canada, agrees. "With road trips you don’t have to plan in advance, you can just get into a car and drive. "
Even with high gas prices, driving with friends is cheaper than flying. Roberts paid about 40 dollars for gas, but a round trip plane ticket would have cost nearly 400 dollars.
Driving trips first became popular in the 1920s. Newly paved roads and improved cars made it possible to travel longer distances. Motels started appearing outside cities.
By the 1950s, car ownership became the norm. Construction of the US interstate highway system began in 1956 and motel and restaurant chains popped up everywhere making long distance trips easier.
Today, the US has the highest car ownership rate in the world. Only 8 percent of American homes have no car, according to the most recent US census.
Though many college students don’t own a car, most have access to one. On many of Hawkins’ trips, they used a borrowed van.
Hawkins’ most memorable road trip took place over spring break. He and two friends drove from New York to New Orleans to volunteer, helping rebuild the city after Hurricane Katrina hit it last July. They crossed the country in two days and slept in their car in church parking lots.
Roberts’ road trip to Canada last winter was even more eventful. Upon arriving in Montreal, they were lost in a blizzard and shivering in the -25~cold. To find their hotel, they turned on a laptop and drove around in circles until they found a spot with wireless Internet coverage.
"I know we should have planned better, but we’re young. Now, when I see those guys I always say: ’Remember when we were lost in the snow storm! ’ I’ll never forget that. \

What will Hawkins do when he sees something interesting on a road trip

A．He will turn back.

B．He will drive around.

C．He will stop to explore.

D．He will stop explorin
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材料题

       材料一：凡未经议会同意，以国王权威停止法律或停止法律实施之僭越权力，为非法权力。议会议员之选举应是自由的。

       材料二：“我们以这些殖民地的善良人民的名义和权力，谨庄严地宣布并诏告：这些殖民地从此成为、而且名正言顺地应当成为自由独立的合众国；他们解除对英王的一切隶属关系，而它们与大不列颠王国之间的一切政治联系也应当从此完全废止。”

       材料三：在权利方面，人们生来就是而且始终是自由平等的。任何政治结合的目的都在于保存人的自然和不可动摇的权利。……私有财产是神圣不可侵犯的。

请回答：

（1）上述三段材料分别出自哪个国家的什么文件？

                                                                                                                                                             

                                                                                                                                                             

                                                                                                                                                             

（2）材料一的文件颁布后有何作用？

                                                                                                                                                             

                                                                                                                                                             

（3）材料二的文件的重要意义是什么？

                                                                                                                                                            

                                                                                                                                                            

                                                                                                                                                            

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