若3xm+n-5yn-m=0是二元一次方程,则m=______,n=______.
根据二元一次方程的定义可知:m+n=1n-m=1,
解得:m=0n=1.
故答案为:0,1.
Don’t worry. The blind man to walk across the road soon by the policeman.
A.is helped
B.will be helped
C.was helped
D.has been helped
下列流中()构成电子商务的组成要素。
A.信息流
B.资金流
C.人员流
D.实物流