专职瓦斯检查员有什么要求？

“用微观的视角看现象”是我们学习化学的重要方法．请你回答：数学上有“1+1=2”的“歌德赫猜想”，化学上却有“1+1≠2”的现象，如1mL的酒精与1mL的水混合，混合后所得溶液的体积______（选填“＞”、“＜”或“=”）2mL，原因是______．

烟火药中常用的可燃剂有（）。

A、木炭粉

B、铝粉

C、镁粉

D、硫磺

实行无差异目标市场营销策略，其优点是（）。

A.总销售量会增加

B.能充分挖掘企业潜力

C.营销稳定性好

D.成本低

Riding School:

You can start horse-riding at any age. Choose private or group lessons any weekday between 9 a.m. and 8:30 p.m. (3:30 p.m. on Saturdays). There are 10 kilometres of tracks and paths for leisurely rides across farmland and open country. You will need a riding hat.

Opening Hours: Monday through Friday:9:00 a.m. ~ 8:30p.m.

Phone: (412) 396-6754 Fax: (412) 396-6752

Sailing Club:

Our Young Sailor’s Course leads to the Stage Sailing qualification. You’ll learn how to sail safely and the course also covers sailing theory and first aid. Have fun with other course members afterwards in the clubroom. There are 10 weekly two-hour lessons (Tuesdays 6p.m.~ 8p.m.)

Opening Hours: Tuesdays: 6:00p.m.~ 8:00p.m

Phone:( 412)396-6644Fax: (412) 396-6644

Diving Centre:

Our experienced instructors offer one-month courses in deep-sea diving for beginners. There are two evening lessons a week， in which you learn to breathe underwater and use the equipment safely. You only need a swimming costume and towel. Reduced rates for couples.

Opening Hours: Monday and Friday: 6:30p.m.~ 8:30p.m

Phone: (412)396-6312Fax: (412) 396-6706

Medical Center:

The staff of the Medical Center aim to provide convenient and comprehensive medical care to students and staff of the university. The center is well equipped and the staff here are trained to deal with a broad range of medical problems. Both female and male doctors as well as nursing staff are available for consultation. Also， all kinds of medicines are sold here and are cheaper for students than other drugstores.

Opening Hours: 24 hours from Monday to Sunday

Phone: ( 412)396-6649Fax: (412) 396-6648

Watersports club:

We use a two-kilometre length of river for speedboat racing， and water-skiing. A beginners’ course consists of ten 20-minute lessons. You will learn to handle boats safely and confidently but must be able to swim. The club is in a convenient central position and is open daily from 9 a.m. to 4 p.m.， with lessons all through the day.

Opening Hours: Monday through Friday: 9:00a.m.~ 4:00p.m

Phone: (412)396-6899 Fax: (412) 396-6890

小题1:If you want to swim and enjoy activities which are fast and a bit dangerous， you should join _______ .

A．Sailing Club

B．Riding School

C．Watersports Club

D．Diving Centre小题2:If you are planning to explore the ocean depths， you should attend your lessons at_______ .

A．24 hours from Monday to Sunday

B．Monday through Friday: 7:00 a.m.~ 10:00 p.m.

C．Tuesdays: 6:00 p.m.~ 8:00 p.m.

D．Monday and Friday: 6:30 p.m. ~ 8:30 p.m.小题3:If you want to do an activity one evening a week and get a certificate in the end， you can go to _____ .

A．Sailing Club

B．Diving Centre

C．Watersports Club

D．Riding School

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