问题
单项选择题
为提高旋转阳极管的瞬时负荷，可采取的措施中，错误的是
A．提高阳极旋转速度
B．增大阳极倾斜角度
C．加大焦点轨迹直径
D．使用钼钨复合靶盘
E．减小管电压脉动率
答案
参考答案：C
解析：其余均有助于提高旋转阳极管的瞬时负荷。
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为提高旋转阳极管的瞬时负荷，可采取的措施中，错误的是
A．提高阳极旋转速度
B．增大阳极倾斜角度
C．加大焦点轨迹直径
D．使用钼钨复合靶盘
E．减小管电压脉动率
参考答案：C
解析：其余均有助于提高旋转阳极管的瞬时负荷。
Last weekend, my kids along with few other kids from the neighborhood volunteered to help me wash my car. My 10-year-old daughter came up with the idea of 36 other people’s cars as well. It was pretty 37 outside and I had no plans to 38 being in the bright sun. She 39 wanted to give lemonade（柠檬汽水）to passers-by for free. I had seen little kids 40 and sell fresh lemonade for a small cost but not free. Although I felt 41 , I decided to help her. 42 she asked me, “What if we 43 this a smile car wash?” I couldn’t hold back my tears and 44 her and the other kids to go outside the house and come up with 45 ideas. While I kept myself busy in drying the car, the gang walked up to me with a（n） 46 with beautiful images of smiles. They had “Free Car Wash” written on it and the 47 of their exercise was “smile”. It was pretty neat to see a team of kids ranging 5-11 years with the 48 to do something for others. All that seemed 49 and came right from their heart. Nothing seemed to 50 to them: their playtime, the heat outside—they just wanted to 51 others and do something nice in the community! I helped them make some fresh lemonade and brought out some additional 52 to help clean cars. Passers-by were 53 and one even shouted back to them saying “God Bless You, my kids…” One of them even tried giving them 5 dollars, which they refused. A pretty heartwarming 54 ! I feel blessed by being 55 by such wonderful and loving souls.
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