The altitude at LAN may be observed by starting several minutes in advance and continuing until a maximum altitude occurs.This procedure should not be used ().
Which factor has the greatest effect on the amount of gain required to obtain a fathometer reading ().
In order for a vessel to be engaged in fishing she must be ().
Chart information details to be used in ECDIS should be the latest edition of information originated by a government-authorized hydrographic office and conform. to the standards of(the)().
What does MBDD mean on the load waterline mark ()_.
This Certificate will remain in force (在有效期中)until May 1,2009.This Sentence refers to ______ of the Certificat
According to the rules,a vessel's length is her ().
Deep-sea liners are ____()
When crossing a front isobars tend to ().
The horizon glass of a sextant is ().
If a person is unconscious from electric shock,you should first remove him from the electrical source and then ().
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