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问题 单项选择题

机械设计的一般原则包括( )。
①可行性原则 ②可靠性原则 ③经济性原则 ④技术性原则

A．①③④
B．①②④
C．①②③
D．②③④

答案

参考答案：C

阅读理解
阅读理解。
? Balancing Work & LifeRobert Holden, Ben Renshaw￡ 9.75
     Balancing Work & Life focuses on the key challenge of our generation. It is a must-read for anyone
who is trying to balance work success, family joy and life fulfillment.
     Practical techniques show you how to identify your goals and make choices.
     Clear text and illustrations (插图) cover every aspect of defining success, implementing (实现) changes and achieving balance.  
     Simple checklists enable you to take control and stay motivated. Accessible flow charts and diagrams
explore different opinions for taking action and provide useful examples.
? Happiness NOW!Robert Holden￡ 7.00
     Happiness NOW! is a powerful journey of exploration and insight into one of life's most treasured goals. Using a highly original mix of stories, exercises, meditations (沉思) and poetry, it offers a message of
profound hope and healing. Radical and compassionate (有同情心的), challenging and practical,
Happiness NOW! delivers the key to true happiness, inner confidence, loving relationships and peace of
mind. This book is the key text for the public seminars of The Happiness Project.
? The Secrets of RelationshipsBen Renshaw￡ 9.50
     Are you looking for a fulfilling relationship? If so, The Secrets of Relationships is a required reading
whether you are single or married. Here is a book that reveals the real answers to the relationship roller
coaster. Read this book and discover: ?The secret of finding the right partner ?The secret of
communicating successfully ?The secret of getting along ?The secret of having what you want Witty,
honest and essential? The secrets of Relationships is your passport to a whole new relationship
experience.
     Order now online, you can get a 10% discount. More information, please click here.
1. Based on the information above, which of the following is NOT true?
A. Happiness NOW! will help you find a right partner.
B. Happiness NOW! can help you build up your confidence.
C. The Secrets of Relationships offers you tips on how to get on with others.
D. The Secrets of Relationships is suitable for readers whether single or married.
2. The information above is probably taken from ________.
A. a magazine
B. a website
C. a guide book
D. a local newspaper
3. If you want to immediately buy a copy of Happiness NOW! and two copies of The Secrets of
    Relationships online, how much should you pay?
A. ￡26.
B. ￡2.6.
C. ￡28.75.
D. ￡23.4.
4. The three books mainly help us _________.
A. make good friends easily
B. improve our life quality
C. hunt for a satisfactory job
D. identify our goals
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单项选择题

按照信令传送所使用的信道来划分，可分为（）两类。

A.七号信令和共路信令

B.随路信令和共路信令

C.一号信令和随路信令

D.七号信令和五号信令
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