facultative

a facultative parasite.

性寄生物。

facultative chemoorganotrophy

性有机化能营养

a facultative enactment

授权的法令

facultative parasites

【生】性寄生物, 性寄生菌

facultative thermophil(e)

性嗜热菌

a facultative parasite can exist as a parasite or a saprophyte.

性寄生菌能够象寄生虫或腐生物一样生存。

Coliform group referred to aerobic or facultative anaerobic gram-negative budless bacillus which could ferment lactose and produce acids and CO2.

大肠菌能发酵乳糖、产酸产气、需和性的革兰氏阴性无芽孢杆菌。