一平面谐波的表达式为y=0.03cos(8t+3x+π/4)(SI),则该波的频率ν(Hz),波长λ(m)和波速u(m/s)依次为:()
A.A
B.B
C.C
D.D
参考答案:A
-- DO you still have a headache, Bill? -- No, it's _________. I'm all right now, mum.
A.dropped
B.run
C.left
D.gone
下列属于32P敷贴治疗的禁忌证的是()
A.夏令湿疹
B.寻常疣
C.毛细血管瘤
D.翼状胬肉
E.粘膜白斑