複選題
3 (AB) phones will be getting juic (AC) the study authors declare it a success on all front. (AD) no interviews, few appearances. Just heads down on work. (AE) it is not clear what leaps need to be made to charge a busy coffee shop. (BC) the approach harnesses ultrasound and optical lasers to charge multiple phones at once at a distance of up to ten feet. (BD) a team led by Georgia Tech engineer Mark Prausnitz has come up with an alternative method that uses “microneedles.” (BE) tech gadgets never run on empty, powered by energy-broadcasting transmitters hidden away in the walls of cars, businesses and homes.