问题
多项选择题
下列常用夹具中（），其基准位移误差等于零。
A.三爪自定心卡盘
B.四爪单动卡盘
C.弹簧夹头
D.机用平囗虎钳
E.间隙心轴
答案
参考答案：A, C
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下列常用夹具中（），其基准位移误差等于零。
A.三爪自定心卡盘
B.四爪单动卡盘
C.弹簧夹头
D.机用平囗虎钳
E.间隙心轴
参考答案：A, C
The young wonman entered the pool where an injured dolphin(海豚) was swimming. Despite her fear,she felt strong wearing her new leg. In her second grade. Maja 1 her cousin.Jasmina.After Jasmina’s death.Maja swore she would honor the little girl by 2 with a dolphin,an animal that both girls 3 .”Jasmina never got the chance to do it.”says Maja.now32,”so I 4 that someday I’d do it for her.” In high school,Maja was 5 about sports. she even planned to become an athlete. 6 ,in 1993. during the eivil war in her home country, a bomb 7 her left leg. After two years’ 8 in the U.S.,Maja received her first artifierd (人造的)leg. But 9 it didn’t fit well, walking for Maja was painfei 10 she managed to graduart from a loca high school. Then after receiving a 11 from Saint Francis University, she got a job at an insurance firm and 12 started her own campany. To relax. Maja 13 ofter watch the dolphins play at an auarium (水族馆)near her home.A young dolphin. Winter, who had lost its tail, eaught her 14 One day,Maja happened to see trainers 15 Winter with a high-teeh tail.When they were done.Winter swam freely in the water.Maja was 16 . She managed to find the inventors of Winter’s tail.Within ten days,she had a new leg which freed her the 17 that had troubled her for almost 16years. Now, Maja was ready to keep her 18 .She went to the aquarium. Lowered herself into the pool and held out a hand to Winter, who approached 19 , then swum away. After a few minutes. The dollop hint let Maja 20 its back Finally .they began to swim around together.
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