近似数70.60有效数字有（ ）个，它精确到（ ）位。
4，百分位
Today she looks ___ . Look ! She is looking ___ at his son.[ ]
A. happy , happy
B. happily , happily
C. happy , happily
D. happily , happy
变压器中性点接地运行方式有何规定？
