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单摆中绳的张力不作功，绳是理想约束。变长度单摆中绳的张力作功，因而绳不是理想约束。

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段落翻译： Whether you are waiting tables or a brain surgeon, any job you do is about serving others and making their life better on some level. We have all had experiences where someone working in their job has lifted us up and made a difference to our day or brought us down and made our day worse. We have all met wonderful people cleaning floors and people who are not so wonderful who have amazing jobs. So whatever your job, how do you bring love to work？ Be grateful for your work. Being grateful doesn’t mean you have to stay in a job you don’t like but it will help you to develop a more positive mindset when you are there. You don’t like your job, but you may enjoy being with your colleagues. This is something to be thankful for. When you practise gratefulness it will really allow you to develop a more useful outlook and be happier at your work.

It is wise to ______ questions in your order of preference.

Each ______ has its own standards of judgment.

数学模型建立的方法包括理论建模和试验建模两种，理论建模指不需要试验进行建模的方法。