A towing light is a yellow light having the same characteristics as a(n)（）
What color exhaust will be exhibited when a slow speed two-stroke/cycle main propulsion diesel engine, designed to operate on light and heavy fuel oil, is operated on insufficiently preheated heavy fuel oil?（）
Lube oil pumps taking suction from the sump of most small marine engines are usually （）.
Some lights used as aids to marine navigation have a red sector to indicate a danger area. The limits of a colored sector of a light are listed in the Light List in which of the following manners?（）
The smallest size of flaw that can be detected on a radiograph examination of a weld will be indicated by the（）.
In discussing oil pollution, one important fact to remember is that the problem remains the same （） heavy （） light oil is spilled into the water.
What is the best instrument for establishing a safe working area before welding in a confined space? （）
A vessel showing a green light over a white light in a vertical line above the level of the sidelights is（）.
The welds used to attach stiffeners to a plate are known as（）.
If the sump（）were to rise this would indicate water leakage into the oil an d an investigation into the cause must be made.
The Light List shows a lighted aid to navigation on the left bank. This means that the light can be seen on the starboard side of a vessel（）.
Before welding in a tank that has carried petroleum products，the tank must be certified by （）.
Main propulsion engine lube oil sumps should be constructed （）
You see a vessel displaying three lights in a vertical line.The highest and lowest lights are red and the middle light is white.She is also showing a white light at the stern，which is lower than the forward light.It could be a（）.
When welding or burning aboard a vessel, you must be certain that the space （）.
The nominal range of a light may be accurately defined as the maximum distance at which a light may be seen（）.
The time required for a lighted aid to complete a full cycle of light changes is listed in the Light List as the（）.
If emergency welding repairs must be made to the upper area of a fuel tank, the tank and/or adjacent compartments may need to be （）
What is the light characteristic of a lighted，preferred-channel buoy? （）
Waste oil from the lube oil sumps of machinery may NOT be （）.
How is the intensity of a light expressed in the Light Lists?（）.
The process to form copper pieces into various shapes with a hammer according to a design, joining them under high temperature is called filigree welding.
190. How is the intensity of a light expressed in the Light List?
The villagers no longer use oil lamps.They have electric lights now.（用instead of改写句子)
