轮机英语阅读理解.doc

This sequence of events is made possible by substituting ports in the bottom of the cylinder wall for the inlet and exhaust valves. There are two groups of these ports, one for exhaust and the other for scavenging air, usually on the opposite sides of the cylinder, but in some designs both groups arc arranged on the same side. The exhaust ports connect with the exhaust manifold, while the scavenging municate with the scavenging air receiver in which low-pressure air is stored. The exhaust ports are slightly higher than the scavenging ports, so that they are uncovered by the piston while the scavenging ports are still closed.
1. From the paragraph above, we know that ________.
A. In general, both exhaust ports and scavenging air ports are on the opposite sides of the cylinder
B. The exhaust ports are on the opposite sides, but the scavenging air ports are on the same sides
C. The scavenging air ports are on the opposite sides, but the exhaust ports are on the same sides
D. Two groups of parts are never arranged on the same sides
2. According to the above paragraph the exhaust ports link with ________.
A. the exhaust valves B. the scavenging air receivers
C. the exhaust manifold D. the scavenging ports
The engine is also provided with a governor which is designed to regulate the engine's speed by adjusting the quantity of oil injected. When the engine runs at a speed higher or lower than that is set, the governor will act automatically reduce or increase the fuel oil supply so that the engine can be adjusted.
3. From this paragraph we can understand that ________.
A. if the engine runs at a speed higher than that is set, the governor will increase the fuel oil supply
B. if the engine runs at a speed higher than that is set, the governor will decrease the fuel oil supply
C. the governor will not act until the engine runs at speed lower than that is set
D. the governor regulates the engine' s speed by adjusting the fuel oil injection
4. The