Small floes of rough，hummocky sea ice capable of damaging a vessel（）.<br>A:can usually be detected by radar in a smooth sea at a range of 4 to 6 kilometers<br>B:are indistinguishable from sea return on the PPI<br>C:are invisible to radar when covered with a thick layer of snow<br>D:are usually seen at night before they are close enough to provide a radar echo

Small floes of rough，hummocky sea ice capable of damaging a vessel（）.
A:can usually be detected by radar in a smooth sea at a range of 4 to 6 kilometers
B:are indistinguishable from sea return on the PPI
C:are invisible to radar when covered with a thick layer of snow
D:are usually seen at night before they are close enough to provide a radar echo

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:【10252937】个 (题库试题定时更新)