问题
选择题
如图所示，一铁球被竖直弹簧拴住，静止时，两条竖直的弹簧均被拉长，当固定弹簧的木箱由静止向下做加速运动时，下列说法正确的是（ ）
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| A．上弹簧的长度变长，下弹簧的长度变短 B．两弹簧的长度均不变 C．上弹簧的长度变短，下弹簧的长度变长 D．上弹簧的拉力变小，下弹簧的拉力不变 |
答案
答案：C
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如图所示，一铁球被竖直弹簧拴住，静止时，两条竖直的弹簧均被拉长，当固定弹簧的木箱由静止向下做加速运动时，下列说法正确的是（ ）
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| A．上弹簧的长度变长，下弹簧的长度变短 B．两弹簧的长度均不变 C．上弹簧的长度变短，下弹簧的长度变长 D．上弹簧的拉力变小，下弹簧的拉力不变 |
答案：C
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| My first job was at a local diner, where I worked for seven years and learned so many lessons, especially from a fellow waitress. Helen was in her 60s and had extraordinary self-respect, something I was really lacking. I 1 to Helen because she was doing what she loved- 2 people--and nobody did it better. She always made everyone, customers and co-workers, 3 and feel good. Being a waitress changed my life. One of my 4 customers was Fred Hasbrook. He always ate an omelet, and when I saw him coming, I tried to 5 it on his table as soon as he sat down. Thanks to the newfound confidence I 6 from Helen, I 7 having my own restaurant. But when I called my parents to ask for a loan (贷款), they said, "We just don't have the 8 ." The next day, Fred saw me and asked, "What's up? You're not smiling today". I 9 my dream with him and said, "Fred, I know I can do more 10 somebody would just have faith in me." 11 he handed me checks totaling $ 50,000--along with a 12 that read, "The only collateral(抵押) on this loan is my trust in your 13 as a person. Good people with a dream should have the chance to realize that dream." I took the checks to Merrill Lynch, where the money was provided for me. I 14 working at the diner, making 15 for the restaurant I would open during the break. My plans failed, 16 ,and I lost the money. Later I decided to apply for a job at Merrill Lynch. 17 I had no experience, I was 18 and ended up becoming a pretty good agent. 19 I paid back Fred the $ 50,000, plus 14 percent annual interest. Five years later, I was able to 20 my own firm. | ||||
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