【单选题】Can you tell me what time ?
【简答题】A.To drive the train. B.To stop the train. C.To start the train. D.To send signals.
【判断题】砖混结构中,墙既是建筑物的承重结构,又是建筑物的围护构件。()
【简答题】A.The train is crowded. B.The train is late. C.The train is empty. D.The traifi is on time.
【单选题】影响离子运动速度的主要因素不包括:( )