航海英语单项选择题每日一练(2019.09.16)

单项选择题
Progressive flooding may be indicated by（）.
A.ballast control alarms
B.excessive draft
C.excessive list or trim
D.a continual worsening of list or trim
单项选择题
The transmission time duration of a single pulse of radio-frequency energy is a function of the（）.
A.persistence
B.pulse repetition rate
C.pulse length
D.resolution
单项选择题
When should the emergency position-indicating radiobeacon be activated after abandoning a ship?（）
A.Immediately
B.After one hour
C.Only when another vessel is in sight
D.Only after sunset
单项选择题
An inflatable liferaft should be manually released from its cradle by（）.
A.cutting the straps that enclose the container
B.removing the rubber sealing strip from the container
C.loosening the turnbuckle on the securing strap
D.pushing the button on the hydrostatic release
单项选择题
The above mentioned ship has been duly（）in accordance with the provisions of the convention referred to.
A.relayed
B.delayed
C.conveyed
D.surveyed