Automobile Engineering in ME
The main purpose of an engine's air cleaner is that it

Prevents rain water from entering the engine
Controls the engine's air intake volume
Prevents dust and other foreign matter from entering the engine
Reduces the engine's air intake noise

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Automobile Engineering in ME
The main feature of Macpherson strut suspension is that

The assembly is slightly more complicated in design
The unsprung mass in lighter
Non vertical external forces are supported by the suspension arms
The vertical size of the suspension can be made more compact

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