Discussion
Which control does an air suspension system need?
Answer: B
The valve senses the distance between the axle and the chassis and admits or releases air until the designed height is restored. Constant pressure would not do, because the pressure needed varies with load. Electronic systems replace the mechanical valve. Most errors here come from carrying across a result from a neighbouring case where it does not hold. Naming the cost of a choice alongside its benefit is what turns a fact into a design decision.
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