ATM信元信头中,HEC字节只对()进行差错控制,在网络中不对用户信息进行差错控制操作。
参考答案:信头
The foreigner was talking to the children in the park ______ he was familiar with them.[ ]
A. even though
B. in case
C. so that
D. as if
脉象表现为沉按实大弦长的脉是()。
A.牢脉
B.伏脉
C.代脉
D.洪脉