更多unidirectional例句

1. Most consumer and hobby-grade unidirectional types of microphones feature at least one of three cardioid patterns.
2. Two support rods and two cantilever springs were needed in place of the one in unidirectional scarificators.
3. Both unidirectional (“plain”) and reversible scarificators were offered through trade catalogs.
4. In some cases the alternating high-tension current is rectified and supplied as a unidirectional current to lamps in series.