医用级 VOL IIIII 5 9 p 2.5灵敏探头 U 2.5MHz ·简单易测量 ·胎心音清晰 ● ● ●● ●●● ● ● ● ● ● o ●●● ● ● ●● ● 0●●●● ● ● ● ●● ● ● ● 区用极声保合司 愿用超声螺合 ● ● ●