问题
单项选择题
凸轮机构中，基圆半径是指凸轮转动中心至（）向径。
A.理论轮廓线上的最大
B.实际轮廓线上的最大
C.理论轮廓线上的最小
D.实际轮廓线上的最小
答案
参考答案：C
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凸轮机构中，基圆半径是指凸轮转动中心至（）向径。
A.理论轮廓线上的最大
B.实际轮廓线上的最大
C.理论轮廓线上的最小
D.实际轮廓线上的最小
参考答案：C
When I walked into the house after school, the first thing I noticed was a box with items I recognized from my dad’s office. “What are you doing at home?” I asked casually. “Andrew, I was 31 today,” he answered quietly. I was sure he was joking. “No, you weren’t. Why are you 32 at home?” Then I noticed his 33 and realized he was telling me the truth. My father has always been a hard worker and prided himself on his career. 34 our family has been his joy, and I guess I have 35 his work for granted. My father’s unemployment 36 many changes in our lives. For starters, he was at home all the time, which meant my bed had to be 37 , my room cleaned up, and my 38 done right after school. I would come home every day to find him at the computer 39 jobs. I began to notice how 40 he seemed, and how losing his job affected his self-esteem, though he tried to be 41 . For the first time, I 42 my dad as vulnerable (易受伤的). He asked my brother and me to 43 less. I gave up my pocket money, 44 it wasn’t much. I felt I was doing the right. I also found a part-time job. After several difficult months of searching, my dad 45 to go in a totally different direction. He 46 that he never wanted to be laid off again, so he was going to start his own business. Day by day, I watched him 47 it, and I admired how much time and 48 he expended. I 49 knew he was a hard worker, but watching him in action really affected me. Although this was one of the 50 experiences for our family, it taught me a lot about dealing with adversity (逆境), and will be my foundations for success.
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