数控系统的主轴变速又叫()功能。
A、T
B、M
C、S
D、G
参考答案:C
His character is without a _____. [ ]
A. field
B. spot
C. place
D. ground
()是遇险呼救频道,不能用于聊天占用。
A.15
B.16
C.17