英 [ˈfækəltətɪv] 美 [ˈfækəlˌteɪtɪv]
adj. 偶发的；授权的；（生物）兼性的
facultative /ˈfækəltətɪv/
形容词 empowering but not compelling the doing of an act 授权的
of or relating to the mental faculties
able to exist under more than one set of conditions
a facultative parasite can exist as a parasite or a saprophyte
granting a privilege or permission or power to do or not do something
a facultative enactment
not compulsory
facultative courses in the sciences
兼氧-引用次数：17
TA could be removed quickly from wastewater in aerobic condition, the removal rate of TA can be above 96% within 12~16h of HRT. By contrast, facultative system could only degraded 15.3% within 210h of HRT.
碱减量印染废水中的TA在好氧状态下，属于易降解有机物，HRT为12～16h，去除率在96％以上；在兼氧状态下，属于难降解有机物，HRT210h，其去除率只有η_(TA)15.3％。
兼性因素
兼生性
兼性的
兼性
容许的
可选择性的
兼性的
... Exotoxin（外毒素）： Facultative（兼性的）： Fermentation（发酵）： ...
...水；废水处理；兼氧；好氧；氧化沟；生物接触氧化 [gap=789]Key words:perfume wastewater; wastewater treatment; facultative; aerobic; oxidation ditch; biological contact oxidation ..
... 因素分析实验 factorial experiment 有条件的；任意的；兼性的 facultative 兼需气性；任意需气的 facultative aerobic ...
授权的，特许的
The coliform group referred to the aerobic or facultative anaerobic gram-negative budless bacillus.
大肠菌群是指需氧和兼性厌氧的革兰氏阴性无芽孢杆菌。
Facultative heterochromatin is the heterochromatin that may become transcriptionally active in specific cell development fates.
兼性异染色质是在特定细胞发育命运中可能具有转录活性的异染色质。
This method is effective to the facultative anaerobic bacteria or aerobic bacteria with hydrogenase .
这种方法对于用氢化酶的兼性厌氧细菌或需氧细菌是有效的。
Instead, it uses a stationary pump about the size of a lunchbox to inject active, or "vegetative, " bacteria harmless strains of facultative anaerobes into the drains of restaurants, meatpackers, hospitals and photo processing labs.