关于温病特点,下列哪项提法欠妥?() ["可具有程度不同的传染性","病因是感受温邪","发病有一定的地域性","都能在人群中引起程度不等的流行"]
采煤工作面应采取煤层注水,原有自然水份或防灭火灌浆水份大于()的煤层除外。 ["6%","5%","4%","3%"]
关于温病的基本概念,下列哪项提法欠妥?() ["以发热为主症","具有传染性","易化燥伤阴","热象偏重"]
采煤工作面应采取煤层注水,孔隙率小于()的煤层除外。 ["4%","3%","2%","1%"]
依据发病季节而定名的温病是:(). ["A.风温","B.春温","C.暑温","D.湿温"]
请简述无源光网络的定义及构成?