【单选题】恶性肿瘤细胞主要通过下列哪种途径入血 ( )
【简答题】试分别从导电的机制与能带的观点说明什么是本征半导体、N型半导体和P型半导体。
【简答题】什么是本征半导体?什么是杂质半导体?各有什么特征?
【单选题】California appears to benefit most from daylight saving time because ___________.
A.
the weather there is windy
B.
it is close to the Pacific Ocean
C.
people there tend to stay outdoors later
D.
people there have more time to do exercise
【简答题】Suddenly the door bursts open and the Time Traveler appears, dirty, disheveled, and bedraggled, with a nasty cut on his chin.
【单选题】Photoshop中为了确定磁性套索工具对图像边缘的敏感程度,应调整下列哪个数值?
【简答题】什么是本征半导体,P型半导体、N型半导体?并写出本征半导体的费米能的计算式。