Do you want to go________? ( )
A:to
B:from
C:inside
已知M=m+3m-4是m+3的算术平方根,N=n-22m-4n+3是n﹣2的立方根,试求M﹣N的值.
请回答下列问题:
单项式-2xy的系数是 ____,次数为____.