单项选择题
A.Oxygen deficient spaces B.Compartments containing poisonous vapors C.Fighting fires that produce heavy smoke D.Underwater search
The purpose of storm oil in a sea anchor is to（）.A.weig...
单项选择题The purpose of storm oil in a sea anchor is to（）.
A.weigh down the anchor B.lubricate the anchor C.repel dangerous fish D.smooth the sea
The process of waiting a period of time before pretensi...
单项选择题The process of waiting a period of time before pretensioning an anchor is known as（）.
A.soaking B.settling C.sinking D.bedding in
The most probable position of the object of a search at...
单项选择题The most probable position of the object of a search at any given time is the（）.
A.datum B.estimated position C.search point D.initial point
