题目内容

A vessel engaged in（）shall not impede the passage of any other vessel navigating within anarrow channel or fairway.

A. mine clearance operation
B. towing operation
C. dredging or surveying or underwater operation
D. fishing

查看答案

搜索结果不匹配？点我反馈

更多问题

A. 正确
B. 错误

A. 有黄素囊肿者为侵蚀性葡萄胎
B. 子宫标本镜下未见绒毛结构，仅能见到成团的滋养细胞者为绒毛癌
C. 侵蚀性葡萄胎都有肺内转移，而绒毛膜癌无肺内转移
D. 两者发病都可继发于足月产或流产后
E. 葡萄胎清宫后间隔半年以上者为绒毛膜癌