对浆砌封顶石已出现的局部松动或勾缝脱落要及时垫平、砌筑、（）。A.勾缝 B.盖土 C

The high school years are a key period. The things we learn during this time really shape our lives. Liu Changming, principal of Beijing No. 4 High School made 18 suggestions for students just starting high school on how to get the best out of high school. Here are ten of them.

1) Read 50 books. But choose them from ten different fields.

2) Help a person. Look for a classmate, an elderly person, in fact anyone who could benefit（获益）from your help. You’ll find you benefit too!

3) Research. Research a particular area, such as science, history or art.

4) Make a foreign friend. Try to befriend someone from a foreign country. It’s an ideal way to learn about a foreign country.

5) Publish（出版）an article. Whether it appears in a newspaper, your school magazine or in your own blog, an article will be something to look back on in pride in later years.

6) Take up a new sport. Choose one you’ve never played before. If you find you like it, you’ll have a hobby for life

7) Join a club. Working hard in a club or other activities will give you a life outside of your studies.

8) Find a part-time job. Try and do the job for at least a month.

9) Find a person to learn from. Choose someone with unusual experience or special talent. Try to learn all you can from him or her.

10) Learn to cook four Chinese dishes. Learning how to cook is not only a practical skill but a way of building a bridge to other people.

小题1: According to the passage, by making a foreign friend you can ______.

A．learn about another culture

B．practice spoken English

C．discuss the international situation

D．share your happiness and sadness小题2:Beside learning a practical skill, another purpose of learning to cook is ______.

A．to help your parents with housework

B．to kill time

C．to have communication with others

D．to make friends小题3:Which of the following statements is True according to the passage?

A．You should read fifty books of the same field.

B．Do a part-time job for less than a month.

C．Try to publish an article to make you famous.

D．You can benefit a lot by helping others.小题4:The principal made the suggestions in order for the students to ______.

A．make contributions to society

B．achieve greet progress in high school

C．love high school life

D．finish high school

莎士比亚中期创作的重要悲剧有（）。

A.《罗密欧与朱丽叶》

B.《哈姆莱特》

C.《奥赛罗》

D.《李尔王》

E.《麦克白》

诊断慢性细菌性前列腺炎主要依据（）

A.性功能下降

B.尿频、尿急、尿痛

C.会阴区不适，疼痛

D.下腰区疼痛

E.反复尿感发作和前列腺液查出细菌

2010年12月12日8时，河南大营镇一煤矿入井101人，其中主井61人，副井40人。12月11日下午4点，发现l号工作面防火墙向外冒烟，12日8时安排打一道防火墙，7时30分郑某到1号工作面确定防火墙位置，发现迎头冒顶严重，决定距原密闭墙向15m处打防火墙，8时10分许，班长范某和煤师王某在1号工作面安排本班工人打密闭墙。约10时许，冒顶处高顶瓦斯发生爆燃，高温冲击波将正在1号工作面工作的邓某等6人烧伤，在井下工人的帮助下，6名伤员很快升井，并送往医院。矿辅助救护队下井处理火区，主井人员都撤到运输大巷休息。11时35分，井下发生瓦斯煤尘爆炸，当时井下有76人，其中10人受伤，66人遇难。
根据以上场景，回答下列问题：

组合机床有何特点