动车组的()警报会出现蜂鸣器连续鸣响直到事件得到确认或静音按钮被按下。
参考答案:A类
The accident happened at nine o'clock in the morning ____ we were all busy with our work. [ ]
A. that
B. which
C. when
D. as
皮水因阳郁而出现四肢水肿,聂聂跳动者,当选用防己茯苓汤。