铣刀的切削速度方向与工件的进给运动方向相同时的铣削称为（）
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以下哪种加工工艺不可以在铣床上加工？
A. 齿形加工
B. 键槽加工
C. 阶梯轴加工
D. 复杂台阶面
How many people were killed in the helicopter crash?
A. 3
B. 5
C. 7
D. 9
How many NBA championships did Bryant win?
A. 2
B. 3
C. 5
D. 7
Why did Bryant often use helicopters to travel around Southern California?
A. To enjoy the helicopters
B. To save time and avoid the traffic
C. To make himself more comfortable
D. To show off
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