单词	polyvoltine
释义	polyvoltine多化性蚕品种polyvoltine多化性蠶品種紡織科技
随便看	positive definite operator positive definite quadratic form positive definite scalar positive definite scalar product positive definite second variation positive definite sequence positive definite symmetric matrix positive definite transformation positive definitness positive degree positive density positive derail positive detection loop positive developer positive deviation positive diageotropism positive differential resistance positive direction positive-direction only energy flow positive discrimination positive displacement positive [displacement] blower positive displacement blower positive-displacement compressor positive displacement flow meter