若单项式x2ym+1与2xny的和是单项式,那么m+n=______.
根据题意得:n=2m+1=1,
解得:n=2m=0.
则m+n=2.
故答案是:2.
—Can you imagine ____________the Taiwan HEDP(塑化剂) event will affect our life?
—I’m not sure. Many people have begun to have water instead of drinks.
A.how far
B.how many
C.how often
D.how much
(EMB145)正常情况下,三套VHF由()控制。
A.RMU1控制VHF1和VHF3
B.TBCH可以控制VHF1和VHF2
C.RMU1控制VHF1,RMU2控制VHF2