兼容
参考答案：
黑白电视机和彩色电视机都可以收视对方电视台播放的节目而显示正常的黑白图像。
Not until he promised to return it to me as soon as possible ____ my electronic dictionary to my classmate.
A．had I lent
B．did I lend
C．I had lent
D．I lent
在外贸业务中，保险单出单日期必须早于海运提单日期。
