问题
单项选择题
轮廓曲线位于圆柱面上并绕其轴线旋转的凸轮称为（）
A.盘形凸轮
B.移动凸轮
C.转动凸轮
D.圆柱凸轮
答案
参考答案：D
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轮廓曲线位于圆柱面上并绕其轴线旋转的凸轮称为（）
A.盘形凸轮
B.移动凸轮
C.转动凸轮
D.圆柱凸轮
参考答案：D
In America and Canada, people also have___16__festival. It is____17___ Thanksgiving Day. It is ____18____the fourth Thursday of November.On that day,families get together and eat a big____19____.They have a lot of___ 20____for dinner.They usually eat turkeys. A turkey ____21____a chicken, ___22____ it is much bigger____23____a chicken.In America and Canada, many people say ____24___for the ____25____. .
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