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阅读理解。 Dear Amy, Is there any way I can get my mum to drive to school? She says walking is good exercise. My friend Ann lives closer to the school, but her mum drives her to school. She is there in two or three minutes! Going by car is the fastest way. She doesn't get wet if it is mining either. It takes me about ten minutes to walk to school. If it rains, I'll get wet. It isn't fair} What shall I do? Mary Dear Mary, I think you want me to feel sorry for you! But I don't feel sorry for you. I think you just want a few more minutes in bed in the morning. Walking is good exercise! Lots of people don't get enough exercise, so I think it is probably a good, idea for you to walk. You are going to school in the healthiest way. You may not be the closest to the school, but you are close. A ten-minute walk to school each day will help to keep you fit. Maybe you need an umbrella for wet days? I'm sure your mother has made sure you have a good coat and. boots (雨靴) for wet days. Maybe you just don't want to use them because they are not in? Try to think positively (积极地) about the walk! Amy 1. In the first letter, Mary _________. A. gives warnings B. gives advice C. asks for advice D. expresses thanks 2. What will probably happen to Mary on wet days? A. She'll get wet. B. She'll go to school in her mother's car. C. She'll get sick. D. She'll drive to school. 3. How long does it take Mary to school? A. 2 or 3 minutes' walk. B. 10 minutes' walk. C. 2 or 3 minutes' drive. D. 10 minutes' drive 4. What does Amy tell Mary to do? A. Have a talk with her mother. B. Do a lot of exercise instead of walking every day. C. Ask Ann and her mother for help. D. Take the way of walking to school as it is good exercise. 5. What does 'in' mean? A. New. B. Fashionable. C. Tidy. D. Traditional.
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【判断题】当柱塞供油有效行程一定时,喷油泵的循环供油量 就一定 。( )
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【简答题】名词解释:柱塞供油有效行程
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【判断题】《巧儿我自幼儿许配赵家》选自评剧《刘巧儿》。
A.
正确
B.
错误
【判断题】调节柱塞式喷油泵供油量也就是调节柱塞的有效行程。
A.
正确
B.
错误
【判断题】当柱塞供油有效行程一定时,喷油泵的循环供油量就一定。()
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正确
B.
错误
【单选题】柱塞的有效行程,是柱塞从供油开始到供油结束时的行程,当有效行程为零时,柴油机处于()状态。
A.
高速运转
B.
中速运转
C.
低速运转
D.
停止运转
【简答题】柱塞式喷油泵中,当直槽与径向油孔对准时,柱塞的供油有效行程为( ),喷油泵停止供油。
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