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当前学科：高级钳工
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有一差动螺旋传动，固定螺母的导程Sa=1.6mm，活动螺母的导程Sb＝1.8mm，螺纹均为左旋，当螺杆转0.5转时，活动螺母的移距是（）。
A . －0.1mm
B . ＋0.1mm
C . －1.7mm
D . －0.2mm
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When I was 13 my only purpose was to become the star on our football team. That meant Miller King, who was the best at our school.Football season started in September and all summer long I worked out. I carried my football everywhere for .Just before September, Miller was struck by a car and lost his right arm. I went to see him after he came back from . He looked very , but he didn’t cry.That season, I all of Miller’s records while he the home games from the bench. We went 10-1 and I was named most valuable player, I often had crazy dreams in which I was to blame for Miller’s .One afternoon, I was crossing the field to go home and saw Miller going over a fence—which wasn’t to climb if you had both arms. I’m sure I was the last person in the world he wanted to accept from. But even that challenge he accepted. I him move slowly over the fence. When we were finally on the other side, he said to me, “You know, I didn’t tell you this during the season, but you did .Thank you for filling in for .” His words freed me from my bad . I thought to myself, how even without an arm he was more of a leader. Damaged but not defeated, he was ahead of me. I was right to have him. From that day on，I grew and a little more real.
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