IEEE802局域网参考模型将数据链路层分为( )和介质访问控制子层。
参考答案:逻辑链路控制子层
用英文数字填空
1. four + eight = ___________
2. seven + eight= ___________
3. thirteen + seven = ___________
4. fourteen + sixteen = ___________
5. seventy - fourteen = ___________
6. eighty - sixteen = ___________
7. sixty - thirteen = ___________
8. eighty - forty= ___________
9. forty-eight - twelve= ___________
10. ninety + five = ___________
为提高镗缸质量,镗缸时定位基准应选择()。
A.缸体下平面
B.缸体上平面
C.上下均可