When 20,000 pounds (9072 kg) is loaded onto the frame of a truck it lowers by one-inch (25 mm). However, another 30,000 pounds (13,608 kg) has to be added before it lowers another inch (25 mm). Which of the following types of suspension is this truck likely to have?
A. pneumatic
B. standard leaf spring
C. progressive leaf spring
D. equalizing-beam
Answer: C
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