Sometimes, when people first see an automobile factory, they think it has no form. It is so big that it is impossible to see the design of the whole plant. In fact, the factory has been very carefully de signed, so that it can be as efficient as possible.
There is not just one assembly line in the factory; there are several. On the main one, the chassis (车架) of the car is put together. The chassis is the frame on which the rest of the car is built. In another part of the factory, the body of the car is stamped out on sheets of steel. The body is painted, and then the two assembly lines come together. The body is lowered onto the chassis and fitted to it.
Meanwhile, in still another part of the factory, the engine is being put together on another assembly line. The central part of the engine is called the block, and the various other parts of the engine are fitted to it by different workers as it passes down the line. An internal combustion engine is a complicated
A. how a car is made
B. the assembly line technique in a car factory
C. how complicated a car is
D. how a car is designed
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