介绍:
Vocabulary
frequency
how often something repeats; electrical current frequency is the number of times a wave repeats a positive-to-negative cycle
synchronous
occurring together at the same time, place or rate
a bit of a pickle
informal expression meaning a difficult situation with no obvious answer
charge up
get the power needed to work; recharge
anomalies
differences from what is usual or expected
solid state
electronics using semiconductors which have no moving parts and can automatically convert different electrical currents
