水质稳定性的签别常用（）TL和（）IR定性。
参考答案：饱和指数；稳定指数
Seldom______computer games ever since he entered college.
A．did he play
B．has he played
C．he played
D．he has played
公墓是否可以自行扩大墓区范围或改变其它核定事项？
