SDH中与同步网有关的传输损伤指标有（）和（）。
参考答案：受控滑动率指标；漂移
要想正确的处理医疗纠纷案件，首先要（）。
A、调查
B、实事求是
C、分清责任
D、认真
—How was your journey last week?
—Very interesting. The people there still keep the custom _____ the Ming Dynasty, which is different from other areas.
A．dating back to
B．dating back
C．dated back to
D．dated back
