当所设计的无洞墙体高厚比不满足要求时，可采取（）的措施。A．减小作用于墙体上的荷载

施工升降机齿条齿宽磨损（）后应报废

A．1mm

B．1.5mm

C．2mm

D．4mm

命题“同角的补角相等”是 _________ 命题，写成“如果…那么…”的形式．如果 _________ 那么 _________ ．

下列关于细胞知识的说法中，正确的是（　　）

A．生物都是由细胞构成的

B．植物细胞中的叶绿体和线粒体能将光能转变成化学能

C．细胞中的物质都是自己制造的

D．并不是所有的物质都能通过细胞膜

Last year, over 206,000 students from the United States studied abroad. Does that number surprise you? These students already know the benefits of studying abroad. You may be wondering why you should study abroad. Here are some answers for you.

◆ Timing

The absolutely best time in your life to study abroad is when you are in college. If you miss this opportunity, it’s almost impossible for you to do it later in life.

◆ To gain cross-cultural experience

Life overseas makes you see your everyday world in a whole new light. You don’t even realize it, but our culture shapes the way we view the world and affects us every minute of the day. Differences in culture are more than just differences in language, food, clothing and art.

◆ To improve your communication skills and your self-confidence

People who study abroad tend to be willing to take risks, willing to put themselves in unusual situations, and able to solve problems.

◆ To become more fluent in a language or to learn a new language

The world market is becoming smaller, and many companies require a second language. Foreign languages are not only valuable in the job market but also valuable in the real world.

◆ For the adventure

Travel to other cities within your host country and around neighboring countries. As you get to know your new classmates, roommates, and host family, you will gain a unique view on the host culture. Discover the differences and, more importantly, the many similarities between your worlds. The friendships you make will last long after the program.

◆ To learn more about yourself

Find out who you really are. What are your limits? How do you overcome the difficulties you’ve never encountered before? How independent are you? These questions are hard to answer until you are removed from your usual surroundings. After solving difficult problems on your own overseas, you’ll find that almost nothing will confuse you at home. Students who study abroad commonly report that their study abroad experience actually changed their lives.

小题1:The passage mainly talks about _______.

A．the benefits of studying abroad

B．the time for studying abroad

C．the difficulty you come across when you're abroad

D．some tips on how to get used to a new environment小题2:What is the best time in your life to study abroad according to the passage?

A．When you're at work.

B．When you are free.

C．At any time you like.

D．When you are in college.小题3:What does the underlined word“encountered” here mean?

A．Opposed.

B．Experienced.

C．Solved.

D．Explained.小题4:All of the following are mentioned in the passage as reasons for studying abroad EXCEPT _______.

A．getting cross-cultural experience

B．improving communication skills and self-confidence

C．improving your foreign language

D．learning how to get along with people

通常颌面部随意皮瓣的长宽比例为

A．1：1

B．1．5：1

C．2～3：1

D．4～5：1

E．6：1