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...
The plug broke, exposing live wires.插头坏了,带电的电线露在外面。Plaster had fallen away in places, exposing the brickwork.有些地方的灰泥脱落了,露出了砖。He smiled suddenly, exposing a set of amazingly white teeth.他突然一笑,露出一口雪白的牙齿。...