981The sharpness or detail of a digital photo is commonly described in terms of the number of what small picture elements it contains?
982A hybrid car is generally powered by a combination of an internal combustion engine and what other power source?
983Fully electric vehicles are generally powered primarily by what energy storage and delivery system?
984An electric fan generally converts electrical energy into what form of energy to move air?
985Modern elevators and escalators generally rely mainly on which type of system to move people between levels?
986Digital clinical thermometers commonly used today generally measure human body temperature using what kind of sensor, instead of mercury?
987Older dial-up internet connections historically relied on a device called a modem mainly to do what?
988What does the common computer file format abbreviation PDF generally stand for?
989What does the common computer hardware abbreviation USB generally stand for?
990Kevlar, a strong lightweight synthetic fiber, is widely known for its use in manufacturing what protective equipment?
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