Describe the role of a chemist and the role of a chemical engineer

Is one of the most injurious events that can happen to a person in a crash.

Idon understand these and need some ! ?

After you clean an engine with hot water spray, it seems to stall; when it doesn't stall, it's idling noisily. technician a says to check for loose bolts on the flex plate near the torque converter. technician b says to wipe down the spark plug wires and the distributor cap. who is correct? a. technician a b. both technicians a and b c. technician b