若n>0，且对于所有的x，9x2+mx+36=(3x+n)2都成立，则m-n的值为：()。
B
暂无解析
Everyboyandgirl___(treat)inthesameway.
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两列波的表达式分别为y1=cos2Avtx(/)和y2=cos2Avtx(/)，两波叠加后在坐标原点x=0处的振幅为()
Whenhewasarrested,Terry_________incrimeforyears.