急性上消化道出血最常见的病因（）。 A.溃疡病出血 B.应激性溃疡 C.食管静脉破裂

腹部体毛的分布，下列哪一项描述是错误的（）

A.女性胸骨前体毛可向下延伸达脐部

B.男性阴毛分布呈三角形尖端向上，可沿前正中线达脐部

C.女性阴毛为倒三角形，上缘为一水平线止于耻骨联合上缘

D.腹部体毛增多或女性阴毛呈男性分布，见于皮质醇增多症

E.腹部体毛稀少，见于腺垂体功能减退症

Brian arrived at San Francisco airport two hours before the flight to Paris. He was wearing three shirts, a jacket, two pairs of socks, a pair of shorts, and two pairs of jeans. He was carrying one small backpack, which was very full, but he didn’t have any other luggage. Brian needed to meet a man named Tony before he checked in for his flight. He found Tony near the Air France counter. Tony gave him a round trip ticket and a small package.
"Give this package to Jean Paul at the airport in Paris. He will have a sign with your name on it. I think you can find him easily," Tony said," You don’t have any luggage, right"
"Only this backpack," Brian answered. "You said I could bring one carry on bag. "
"That’s right. One carry on bag is fine. Have a good trip. "
"Thanks. "
is Brian a criminal Not at all. He is an air courier. And he paid only $ 110 for the round trip ticket to Paris. Air couriers get cheap airline tickets because they take important packages and papers to foreign countries. Businesses sometimes need to get packages and papers to people in foreign countries by the next day. Often, the only way they can do this is to use an air courier company. It is not cheap for a business to send a package with an air courier, but it is quick.
Every year about 80,000 people worldwide travel as air couriers. The number of tickets for courier travel is growing by about 10 percent a year. However, air courier travel isn’t for everyone. But if you have very little money, can be flexible about your travel plans, and don’t mind wearing the same clothes for a week, it can be a great way to take a vacation!

An air courier is a person who ______.

A. manages a business company in foreign countries
B. organizes international flights for tourists
C. travels around the world with cheap tickets
D. delivers papers and packages to foreign countries

下列对一些塑料制品的叙述中，不正确的是[ ]

A．塑料凉鞋可以热修补，是因为制作材料是线型高分子材料，具有热塑性

B．聚乙烯塑料是线性高分子材料，具有热塑性，可反复加工多次使用

C．塑料制品废弃后采用深埋作业，是因为塑料制品易分解

D．酚醛塑料制品如电木插座不能进行热修补，是因为酚醛塑料是体型高分子，不具有热塑性

水轮机调节保证计算中，改善大波动过程的措施是什么？

影响利率期限结构形状的因素有______。

A．收益率曲线

B．市场效率低下或者资金从长期(或短期)市场向短期(或长期)市场流动可能存在的障碍

C．债券预期收益中可能存在的流动性溢价

D．对未来利率变动方向的预期