A:酸性:H2SO4>H3PO4
B:碱性:NaOH>Mg(OH)2
C:热稳定性:Na2CO3>NaHCO3
D:非金属性:Cl>Br
关于材料与技术的应用,下列说法中正确的是( )
配方x2﹣8x+____=(x﹣____)2.
一 What if someone calls you when you are out?
一 Well. If anyone calls, tell him I'll come back soon.