《孔雀东南飞》是我国文学史上最早的长篇叙事诗。( )
参考答案：对
Jack wanted to get a ticket to Titanic, but there was ____ left. [ ]
A. no
B. not
C. none
D. one
对接式接头其相对错距最大不超过（）mm。
A.50
B.40
C.60
