Semiconductors containing such impurities are called p - type semiconductors.含有这类杂质的半导体叫做P型半导体.It is not possible to name any particular conductivity at which metals end and semiconductors begin.不可能说出在哪个特定的导电系数处是金属和半导体的分...
North American lobelia having brilliant red flowers.长有鲜艳红花的北美半边莲.North American wild lobelia having small blue flowers and inflated capsules formerly used as an antispasmodic.北美野半边莲,开蓝色小花,以前充入胶囊里作镇痉药....