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The Middle Class in the United States Has _______ Since

question 25

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The middle class in the United States has _______ since the late 1960s.


Definitions:

Air Brake System

A type of brake system used in large, heavy vehicles that uses compressed air to operate the brake mechanism.

Reluctor Wheels

Components featuring notched or toothed rings that work with sensors to measure the speed of rotating parts, crucial for engine management systems.

Industry Standard

A consensus of best practices, products, or technical specifications adopted as a benchmark in various industries.

Pneumatic ABS

An Anti-lock Braking System (ABS) using pressurized air to prevent wheel lockup during braking, typically in heavy vehicles.

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