对于学生来说,适宜睡眠时间是()。
A.中学生9小时
B.小学生11小时
C.小学生10小时
D.大学生8小时
E.大学生7小时
参考答案:A, C, D
阅读短文,判断对(√)错(×)。
Hello, My name is Amy. I have a new classroom It's big and nice. There are many desks and chairs in the
classroom, and I have a new desk. It's near the door. I have a new teacher. She is beautiful. I love my new
teacher.
( ) 1. Amy has a new classroom.
( ) 2. It's small and clean.
( ) 3. Amy's desk is near the window.
( ) 4. She has a new teacher.
( ) 5. She doesn't like her new teacher.
使用刀具半径补偿指令配合修改刀具半径存储地址中的值,除改变刀具直径不用重新编程,还可以()。
A.获得良好的粗糙度
B.控制铣槽、铣孔的尺寸公差
C.改变刀具磨损状况
D.提高刀具耐用度