A partly submerged vessel or object being towed,which is not readily noticeable,shall show () .
To repair a small electrical motor that has been submerged in saltwater, you should ().
To repair a small electrical motor that has been submerged in saltwater, you should ().
In plugging submerged holes on a vessel,rags,wedges,and other materials should be used in conjunction with plugs to().
The maximum draft to which a vessel can legally be submerged is indicated by the ().
To repair a small electrical motor that has been submerged in saltwater, you should ().
To repair a small electrical motor that has been submerged in saltwater, you should ().
An inconspicuous,partly submerged vessel or object being towed,where the length of tow is 100 meters,shall show().
The flash-evaporator is different with the submerged-tube evaporator in that for the former()
The flash-evaporator is different with the submerged-tube evaporator in that for the former()