Which lubricating oil additive is used in diesel engines to reduce the tendency（倾向)for s

A.Splash

B.Gravity

C.Pressure

D.Bypa

The pour point of lubricating oils is affected the most by which of the following？

A.Extensive centrifuging

B.Wax content

C.Water content

D.Acid content

ich is at a higher pressure than the oil. As a result any leak in the cooler will mean a loss of oil and not contamination of the oil by water.()

此题为判断题(对，错)。

A.Low level is monitored on the drain tank and header tank.

B.If there is high differential the filters pressure across the circulating

pumps is alarmed

C.The lubricating oil purifier cannot take oil from the drain tank

D.If the sea water pressure falls, this also operates an alarm

A.Low pressure of the lubricating oil

B.Low level of the lubricating oil

C.High temperature of the lubricating oil

D.High temperature of the cooling water

A.radiator

B.oil filter

C.engine oil

ze of a clenched fist(握紧的拳头).It is positioned on the centre line of the body, about halfway down the chest, just beneath the breastbone.The heart is basically a pump, which forces blood through a network of tubes (软管子), or blood vessels(血管), throughout the whole body.Each of the billions of living cells that make up the body needs oxygen and food in order to live, and these are supplied by the blood.The circulation of the blood consists of two parts.First the blood is pumped from the heart, around the body, and is returned to the heart.At this stage, oxygen has been used up, and waste materials like carbon dioxide (二氧化碳) have entered the bloodstream.But, instead of being pumped back around the body, the blood is now pumped to the lungs, where oxygen is replaced and carbon dioxide is removed.Then the blood is pumped back to the heart and around the body to begin the cycle again.A heart that works well can operate for sixty to a hundred years or more.The heart is made up of four distinct chambers (室).The entire four-chambered pump is surrounded by a protective layer called the pericardium (心包), which contains a lubricating (润滑) liquid.The four chambers of the heart consist of two upper chambers and two lower chambers.The upper chambers are thin-walled and they receive blood returning to the heart from the large veins (静脉) of the body.The lower chambers of the heart are much larger and very much more muscular.The left and right sides of the heart are divided by a tough wall called the septum (中隔).This thick wall separates the blood which is to be pumped to the lungs from the blood which will go to the rest of the body.Blood is kept moving in the proper direction by a series of valves forced open by the pressure of blood and then shut to stop it flowing back.(10 分)

(1).The heart can be compared to a __________________.

A.network

B.valve

C.pump

D.fist

(2).Carbon dioxide is removed from blood in the __________________.

A.heart

B.blood vessels

C.lung

D.cells

(3).Which of the following has NOT been talked about in the above passage？

A.The blood circulatory system.

B.The composition of blood.

C.The function of the heart.

D.Heart valve replacement.

(4).What is the function of septum？

A.To prevent different bloods from mixing.

B.To protect the whole heart.

C.To lubricate the pumping chambers.

D.To separate the lower chambers of the heart.

(5).The valves are __________________.

A.one-way

B.muscular

C.two-way

D.thin

t each other.

A emission control

B cooling

C starting

D lubricating

s receive lubricating oil from().

A.a spindle lubricator

B.an oil jet

C.internal splashing

D.drilled passages in the crankshaft

Stern tube and strut(支柱) bearings lined with hardwood or rubber composition materials are lubricated with______.

A.saltwater

B.graphite(石墨)

C.light lubricating oil

D.heavy lubricating oil