单项选择题
A.possible B.practicable C.impossible D.probably
In the daytime，you see a large sailing vessel on the be...
单项选择题In the daytime，you see a large sailing vessel on the beam. You know that she is also propelled by machinery if she shows（）.
A.a basket B.a black ball C.a black cone D.two black cones
In restricted visibility the speed of a vessel without ...
单项选择题In restricted visibility the speed of a vessel without operational radar may be（）enable effective avoiding action to be taken on sighting another ship.
A.too low to B.too high to C.too high for D.too low for
In restricted visibility a towed vessel must sound a fo...
单项选择题In restricted visibility a towed vessel must sound a fog signal when it is（）.
A.the last vessel in the tow B.the last vessel in the tow and it is carrying a crew C.manned，regardless of its position in the tow D.None of the above are correct
