目前临床常用的肺复张手法包括下列哪几项A.肺膨胀  B.PEEP递增法  C.容量控

电动自行车已经是柳州市大部分市民的主要交通工具，其优点是经济实惠。 如果某一电动自行车电动机的额定功率是240 W，以6 m／s的速度匀速行驶时的供电电流为5 A，则电动机的额定工作电压为________V，若该车电动机的效率为80％，则牵引力为___________N。

一个数，亿位上是8，百万位上是7，千位上是5，其它数位上是0，这个数是______，读作：______．

一般功能分区是以( )作为边界的。

A．道路

B．河流

C．绿化地带

D．建筑物功能

筛检试验在下列哪种情况下是最适宜的

A．病死率高的疾病

B．患病率高的疾病

C．患病率低的疾病

D．病情严重，难以治愈的疾病

E．早期诊断，可改善预后的疾病

Are you interested in seeing the beautiful fall foliage of New England but tired of traffic jams and overbooked hotels Then this year forget the crowds in New England and see the beautiful colors of autumn in the Catskills.

These rugged mountains in New York State, just 90 miles northwest of New York City, are famous for the legendary tales of Rip Van Winkle, and more recently for the summer hotels mat sprang up in the region during the 1940s, 1950s, and 1960s. Families trying to escape the heat of New York City found the Catskills to be the perfect place to stay for a month or so each summer. By the late 1950s there were over 500 resorts and hotels offering nighttime entertainment as well as all kinds of outdoor activities. Famous comedies like Jackie Gleason, Joan Rivers, and Sid Caesar all got their start touring the hotel clubs here. Since the introduction of air-conditioning and cheaper air travel, however, families have stopped coming to the Catskills in such large numbers, chasing instead more distant locations at different times of the year. Many of the Catskills hotels closed in the 1970s, but some remain and have expanded and changed their facilities to meet the needs of today’s visitors.

Currently, there are many activities available to the traveler besides witnessing the changing colors of the leaves. There is an all-organic sheep farm where visitors can see how a traditional sheep farm operates. There are also hundreds of miles of scenic drives in the area. Route 42, for instance, is an excellent site for spotting bald eagles. For more information on vacations in the Catskills, call the office of Public Information.

The phrase "sprang up" underlined in Paragraph 2 refers to something that has().

A. burst forth

B. spread out

C. operated vigorously

D. joined together