当ADSL出现故障时，一般可先根据设备信号灯来判断故障。
参考答案：对
I tired last Friday because I did nothing. [ ]
A. am
B. was
C. wasn't
正常人胰管与胆总管末段开口汇合形成共同通道约
A．90%
B．80%
C．85%
D．95%
E．70%
