问题
单项选择题
发动机曲轴各轴颈的圆度和圆柱度误差一般用（）来测量。
A.游标卡尺
B.百分表
C.外径分厘卡
D.内径分厘卡
答案
参考答案：C
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发动机曲轴各轴颈的圆度和圆柱度误差一般用（）来测量。
A.游标卡尺
B.百分表
C.外径分厘卡
D.内径分厘卡
参考答案：C
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| Billy is a boy of fifteen. His parents died three years ago. One day when he was walking in the street, he 1 a wallet. He returned it to the owner, Mr Baker. He gave his 2 to the boy. As the boy had no job, Mr Baker made him work for him in his 3 . Billy worked so hard that Mr and Mrs Baker were 4 with him. Mr Baker loved planting 5 . The week before last, he brought a few trees home, planted them in the 6 himself and watered them every day. Several days 7 , he had to leave for another city. Before he started, he said to Billy. "Take good care of the trees. Some boys near our house always want to steal (偷) them." "Don't 8 about them, sir." answered Billy, "I'll try my best to watch them." Six days passed and Mr Baker came back. He asked, " 9 anyone ever come to steal the trees?" "No, sir." Said Billy, "To stop someone from stealing the trees, I 10 them up six days ago. I have hidden (藏) them for almost a week!"
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