[单选题]The mariner must be the final judge of the reliance he can place on the information given in the Admiralty charts and other publications，since they ______.
[单选题]Which of the following is usually NOT required in preparing a hold for reception of a bulk grain cargo?
[单选题]The effectiveness of the action shall be carefully checked until the other vessel is finally ______.
[单选题]According to the medical and physical standards for seafarers, whose one eye's distance vision aided is not less than 0.5?
[单选题]When a ship is in tropical zone and in seawater of density 1.025, she must not load to more than the upper edge of the line marked ______.
[单选题]Depths in the routes (Malacca and Singapore Straits) vary between 20 m and about 23 m but there are many areas of sandwaves and depths are liable to change. The statement infers that ______.