问题
单项选择题
数控编程程序中出现G96.S300，是接通恒线速度控制，其中S含义是（）。
A.切削速度是300mm/min
B.切削速度是300m/min
C.主轴转速恒定是300r/min
D.主轴转速限定在300r/min
答案
参考答案：B
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数控编程程序中出现G96.S300，是接通恒线速度控制，其中S含义是（）。
A.切削速度是300mm/min
B.切削速度是300m/min
C.主轴转速恒定是300r/min
D.主轴转速限定在300r/min
参考答案：B
根据短文内容，从A.B.C.D四个选项中选出一个能填入相应空格内的最佳答案，并把答题卡上对应题目的答案标号填黑。 Do you live in a big house? How many _ _ does your house have? I have a pen pal. His _ _ is Liu Jun and he _ _ from Guangxi. His family live in a small house _ _ only two rooms. He lives far from school, but he has to _ _ to school every day because he has no bike. At home, he doesn’t have his own _ _ ---he and his brother and sister sleep in the _ _ room. There is no study. Liu Jun has to do _ _ homework on the bed. He wishes(希望) to have a desk. His brother, a 15-year-old boy, wishes to have a basketball. _ _ he likes playing basketball very much. Liu Jun and his family need our _ _. It’s always nice to help others, right?
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