2007年11月26日,中国国家航天局正式公布“嫦娥一号”卫星传回的第一幅月面图像。该图编制应用的技术手段是
A.RS
B.GPS
C.GIS
D.internet
AC
In our class, when the bell rang and the teacher closed his book, it was a () for everyone to stand up.
A.signal
B.chance
C.mark
D.measure
法家法律思想的基本特征有哪些?