【简答题】编写程序,输入年份和月份,求该月的天数。
【判断题】In a Ge pn junction, above 238 K, Irev is controlled by ni2 and below 238 K it is controlled by ni.
【单选题】已知 E 一 (Ni2 + /Ni) =-0.257V,测得镍电极的 E (Ni2 + /Ni)=-0.210V,说明在该系统中必有( )
【简答题】韩国是( )制度。总统由( )选出,现在总统的任期是( )年。
【判断题】A small fraction of the large number of electrons in the CB recombine with holes in the VB so as to maintain np = ni2