A:36g镁在足量的氮气中完全燃烧共转移的电子数为3NA
B:室温下,21.0g乙烯和丁烯的混合气体中含有的碳氢键数目为3NA
C:标准状况下,44.8 L NO与22.4 LO2混合后气体中分子总数为2NA
D:1 molNa2O和Na2O2混合物中含有的阴、阳离子总数是3NA
Jin Mao Tower has fire and life systems that allow people to save themselves rather than waiting for others to come to their r____.
与直线x-y-4=0和圆x2+y2+2x-2y=0都相切的半径最小的圆的方程是( )
Prices are r____ fast nowadays. 100 yuan can’t go a long way.