A pure ____ engine is an emission-free piston engine that uses compressed air as its fuel.
A. zero-emission
B. air
C. hydrogen
D. flywheel
Answer: B
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Which of the following is true of drain wires in fire alarm and instrumentation cable?
a. They should be twisted. b. They should be No. 24 AWG or smaller. c. Only one end is typically grounded. d. They should be taped back on both ends.
Hormone concentration levels are most commonly controlled by
A) positive feedback. B) the quantity of circulating hormone. C) negative feedback. D) cellular demands. E) body temperature.
Two technicians are discussing hydraulic theory. Technician A says that any fluid will work in a hydraulic system. Technician B says that the fluid must be matched to the application. Who is correct?
A. A only B. B only C. Both A and B D. Neither A nor B
Select a way plastic can be changed in shape.
A. melting B. casting C. spinning D. both b and c