程控交换机中,向用户终端提供接口电路,完成用户话务的集中和扩散,以及对用户侧的话路进行必要控制的模块是()
A、用户模块
B、中继模块
C、信号设备
D、数字交换网络
参考答案:A
—We'll do what we can English well this term.
—It's high time for you to work hard.[ ]
A. study
B. to study
C. be studied
D. be studying
成人晨尿比密的参考范围是()
A.1.015~1.025
B.1.005~1.015
C.1.025~1.035
D.1.010~0.030
E.1.000~1.010