对认证的理解，正确的有( )。
A．认证是自愿的
B．认证的对象包括产品、管理体系
C．认证的对象还包括服务
D．认证的依据是相关技术规范，相关技术规范的强制性要求或标准
E．认证的内容是证明认证的对象符合认证的依据
参考答案：B,C,D,E
解析： 认证是指由认证机构证明产品、服务、管理体系符合相关技术规范、相关技术规范的强制性要求或标准的合格评定活动。由定义可知：①认证的性质是由认证机构进行的一种合格评定活动；②认证的对象是产品、服务和管理体系；③认证的依据是相关技术规范、相关技术规范的强制性要求或标准；④认证的内容是证明认证的对象符合认证的依据。
Learn to relax. Overwork is the main reason why so many students feel tired and stressed. Cut down some of the jobs you need to do each day so that you can only focus on the most important things. Leave time for activities that are relaxing and fun. This might mean reading a good book, listening to the music, going for a walk or taking a relaxing bath. Get a good night’s sleep. Getting enough sleep will help you keep your body and mind in the best form. If you stay up late and need to get up early for school the next day, you may not be able to concentrate on the things you need to do. Exercise regularly and eat well. Don’t rush through your meals. Eat less junk food or fast food. Eat healthy food instead. Get to know pleasant people. Some people are optimistic, while others not. Choose optimistic people as your friends and spend more time with them and you’ll be as happy as them. Learn to be calm when you face any problem. Find out the best option from those that are in your mind. Knowing that you are able to solve problems is a good way to build up your self-confidence. Have a happy attitude. Your attitude decides the way you see things. Is your cup half full or half empty? Learn to think more positively(积极地) about the difficulties you face.
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★ 小题1:______ yourself by cutting down your jobs and taking part in activities.