A:2.1A,0.42A
B:1.68A,0.42A
C:2.1A,1.68A
D:1.78A,0.42A
估算215+87的结果大约是____.
民族区域自洽制度是指在国家统一领导下,各少数民族聚居地方实行区域自治,设立自治机构,行使自治权。( )