A:非金属性强弱为X>Y>Z
B:原子半径为X<Y<Z
C:阴离子的还原性为,X3->Y2->Z-
D:气态氢化物的稳定性为H3X>H2Y>HZ
0.9996保留两位小数是( )
month do best Which you like?(连词成句)
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