A:H2O2
B:MgF2
C:NH4Cl
D:Na2O2
分数单位是 18 的真分数有____个,其中最小的是____
A:I called you yesterday. You didn't answer it. B:Oh, sorry. I_ in the bathroom at that time.
已知ΔABC中,∠A∶∠B∶∠C=3∶7∶8,则ΔABC的形状是( )