The duration of a prolonged blast of the whistle is（）.<br>A:2 to 4 seconds<br>B:4 to 6 seconds<br>C:6 to 8 seconds<br>D:8 to 10 seconds

The duration of a prolonged blast of the whistle is（）.
A:2 to 4 seconds
B:4 to 6 seconds
C:6 to 8 seconds
D:8 to 10 seconds

出自：海船船员证

提示：
同一【IP】的非会员用户每天可免费获取10次答案

收藏本站【zk.995w.com】，下次访问不迷路

本站试题总数:【10252701】个 (题库试题定时更新)