问题
单项选择题
在切削刃上的选定点相对于工件主运动的瞬时速度是（）。
A．主轴转速
B．进给量
C．切削速度
D．刀具移动距离
答案
参考答案：C
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在切削刃上的选定点相对于工件主运动的瞬时速度是（）。
A．主轴转速
B．进给量
C．切削速度
D．刀具移动距离
参考答案：C
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| "Excuse me," said the young man, standing shyly at the open church door. "I'm here to 1 an Easter basket for my daughter. Am I in the 2 place?" "Well, we have baskets, 3 they're not East baskets for kids; they're food baskets," I explained. That morning I had arrived at St. Michael's Church in Carmichael, California, to help 4 the baskets to needy families for Easter. To make sure the needy would 5 the offer, we had handed out numbers to them 6 matched the basket they were supposed to receive. Each one contained a full Easter dinner-a whole ham, potatoes, bread, vegetables and a pie- enough food to help 7 a family for a week. "Why don't you come in?" I said to the man. He looked 8 . He 9 his head, "I can't. My daughter is waiting for me over there. I'm 10 for the food, but 11 I heard you were giving away baskets for Easter, well, I thought they would be Easter baskets for 12 ." He continued, "I 13 my daughter one, and I wanted to surprise her." I felt bad, but there was 14 we could do. The man handed me his 15 , and I walked over to the baskets. A bulge (凸出) in one of the baskets caught my 16 . What was that? I wondered. Leaning over and looking more 17 , I could see, unmistakably, an Easter basket-filled with candy, chocolate and Easter eggs-decorated with ribbons (丝带). One of the 18 must have added it by mistake! I thought. Then I looked at the man's number in my 19 . Well, he'll be... "Happy Easter," I said to the man, handing him the only food basket with an Easter basket inside-the very same basket with his number on it. "Someone already knew just 20 you need." | ||||
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