最有助于鉴别诊断的辅助检查为
A.颈椎X线片
B.颈段断层摄片
C.肌电图
D.颈段MRI
E.核素扫描
参考答案:D
It was ______it rained hard ______ the football match had to be put off till next week?
A.because of, which
B.why, that
C.why, which
D.because, that
程控交换机的硬件系统主要包括七部分:用户线接口电路、中继线接口电路、非话音业务接口设备、()、信号设备、处理机和外围设备。