1.Who are the clubs open to?2.How many clubs can a student join?
What does the passage talk about?It talks about________ .
A. use of the Internet
B. the number of the students
C. American school clubs
D. students' free-time activities in China
数控机床中,转速功能字S可指定( )。
A. m/min
B. r/min
C. mm/min
D. mm/s
G17、G18、G19指令可用来选择( )平面。
A. 曲线插补
B. 直线插补
C. 刀具半径补偿
D. 不运动
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