A:雅鲁藏布江
B:湄公河
C:澜沧江
D:金沙江
铝的逸出功是4.2ev,现将波长200nm的光照射铝的表面.已知普朗克常量h=6.63×10﹣34 J•s.
People in those days liked to believe in computers ________ the world.
等差数列{an}中的a1、a4025是函数f(x)=13x3﹣4x2+6x﹣1的极值点,则log2a2013( )