船舶的航向有＿。
A.罗经航向
B.真航向
C.航迹向
D.陀螺航向
参考答案：A, B, C
Was it the restaurant where he had dinner with me, if I may ask, _______offered him a job?
A．that
B．where
C．which
D．when
一棵二叉树如图所示，其中序遍历的序列为（）。
A．ABDGCEFH
B．DGBAECHF
C．GDBEHFCA
D．ABCDEFGH
