单项选择题
If the freeboard is more than 9 meters, we should rig().
A. gangway
B. ladder
C. pilot ladder
D. gangway combined with pilot ladder
点击查看答案&解析

单项选择题
A. gangway
B. ladder
C. pilot ladder
D. gangway combined with pilot ladder
微信扫一扫,加关注免费搜题