(2008)一平面谐波的表达式为y=0.05cos(20πt+4πx)(SI),取k=0,±1,±2…,则t=0.5s时各波峰所处的位置为:()
A.
B.
C.
D.
参考答案:A
When you burn yourself, _____ can make you feel better. [ ]
A. listening to light music
B. putting the burned area under cold running water
C. stopping loud noise
D. playing computer games
扶正祛邪先后运用的适应证是( )
A.虚实夹杂证
B.真虚假实证
C.真实假虚证
D.虚证