No.7信令系统中，信令信息字段中的标记中有电路识别码CIC，它是由（）个Bit组成。
A.8
B.12
C.16
D.24
参考答案：B
_________a stone tower near the old pine tree.
A．It used to be
B．There used to be
C．There used to have
D．It is used to be
心脏传导阻滞
