Sam and Helen in class3?[ ]
A. Are
B. Is
C. It's
答案：A
溶液中含有NH4+、F-、HSO3-、K+等离子。向其中加入少量NaClO后，溶液中离子数目肯定增加的是
A．F-
B．ClO-
C．HSO3-
D．NH4+
辐照监督管irradiationsurveillancecapsule
Sam and Helen in class3?[ ] 
Sam and Helen in class3?[ ]