资讯

来自MSN4 个月
Cyclopia Syndrome: A rare and severe birth defect explained
SHAH ALAM – Cyclopia, a rare birth defect characterised ... detected as early as 11 weeks of pregnancy through a detailed 2D ultrasound scan. "Observe the first image: a normal brain has two ...
BBC4 年
Sound waves - AQA Ultrasound
Ultrasound close ultrasoundSound with a frequency greater than 20,000 Hz (20 kHz). waves have a frequency higher than the upper limit for human hearing - above 20,000 Hertz (Hz). Different species ...