【判断题】客户端进程不能被指派熟知端口号。 ( )
【单选题】—You _______ to Joey. It was his fault. —The reason why I did so was that I didn't want to lose my friend.
B.
didn't need to apologize
D.
needn't have apologized
【判断题】LED组合式色灯信号机的机构由铝合金材料构成,重量轻,便于维修和施工安装。
【单选题】Although he talked half an hour, he couldn't give us a good ________ of the reason why he did it.