足太阴脾经在胸部循行距前正中线旁开多少寸()
A.6寸
B.5寸
C.4寸
D.3寸
E.2寸
参考答案:A
Paper-making is _____ of ancient China.[ ]
A. one of greatest inventor
B. one of the greatest inventors
C. one of greatest invention
D. one of the greatest inventions
可以将流程概括为先听后发、边听边发、冲突停止、随机延迟后重发的共享介质局域网是( )。
A.CDMA/CD
B.TDMA/CD
C.CSMA/CD
D.FDMA/CD