普通平键按端部形状不同可分为A型、B型和C型三种，其工作表面是上下两面。
参考答案：错
Mr. Li Kunming. He the city three times. This time he Kunming for three days.
A. has been to ,have gone to ,have been in
B. has gone to ,has been to , has been in
C. have been in, has been to ,have gone to
D have gone to, have been in , has been to
打全场的球员在打完9洞后，球童应询问球员是否需要休息、用餐
