肺结核的可疑症状有哪些？最可靠的诊断方法是什么？

在一次抗洪抢险工作中,一架直升飞机A用长H="50" m的悬索(重力可以忽略不计)系住伤员B,直升机A和伤员B一起在水平方向上以 m/s的速度匀速运动的同时,悬索在竖直方向上匀速上拉,如图所示,在将伤员拉到直升机的时间内,AB之间的竖直距离以L=50-5t(单位:m)的规律变化,则(    )

A．伤员经过50 s时间被拉到直升机内

B．伤员经过10 s时间被拉到直升机内

C．伤员的运动速度大小为m/s

D．伤员的运动速度大小为10 m/s

There are many stereotypes( 定型 ) about the character of people in various parts of the United States. In the Northeast and Midwest, people are said to be closed and private. In the South and West, however, they are often thought of as being more open and hospitable . Ask someone from St. Louis where the nearest sandwich shop is, and he or she will politely give you directions. A New Yorker might eye you at first and after deciding it is safe to talk to you, might give you a rather unexpected explanation. A person from Georgia might be very kind about directing you and even suggest some different places to eat. A Texan just might take you to the place and treat you to lunch.

American stereotypes are abundant. New Englanders are often thought of as being friendly and helpful. Southerners are known for their hospitality and warmth. People from the western part of the United States are often considered very outgoing. These differences in character can be traced to different factors such as climate, living conditions, and historical development.

When travelling from place to place, Americans themselves are often surprised at the differing degrees of friendliness in the United States.

1 . The main idea of the passage is _____________.

A. even Americans are surprised at the differences among themselves

B. there are many differences in character in different parts of the USA.

C. there are many reasons for the differences

D. stereotypes about people are not necessarily true

2. Which of the following is true according to the passage?

A. New Yorkers are usually open with strangers.

B. People from the South are usually considered good

C. The friendliest Americans travel from place to place.

D. Different parts have different customs and habits.

3. The differences lie in the following except ______ of the parts.

A. the weather    B. the history    C. geography    D. the names

4 . The word "abundant" in the second paragraph may probably mean _________.

A. plentiful        B. normal      C. curious       D. strange

骨质疏松症是常见疼痛病症之一，该病常见于（）

A.中年男性

B.老年男性

C.中年女性

D.老年女性

E.中老年男、女性

对外加工装配业务的承接方，无论是采用来料加工，还是采用来件装配方式，其赚取的是（）

A.商业利润

B.工缴费

C.佣金

D.手续费

危机干预系指一短期的帮助过程，是对处于困境或遭受挫折的人，运用（）予以关怀和帮助的一种方式.

A.个人

B.家庭

C.社会

D.环境资源