Half-life is the time for the concentration of a reactant decreases by half.
正确
举一反三
- The half-life of a reaction is time needed to consume half the reactant.
- The most relevant measurement in single dose bioavailability studies is A: maximum drug serum concentration B: time to maximum serum concentration C: area under serum concentration –time curve (AUC) D: time for peak drug concentration to fall to half E: time to appearance of drug in circulation (lag time)
- How long has she been there(). A: An hour. B: An hour and a half. C: Half an hour.
- Km is defined as A: Substrate concentration at maximum velocity B: Substrate concentration at half the maximum velocity C: Enzyme concentration D: Optimum temperature
- The apple is too big , let’s cut it [u] [/u] . A: in half B: to half C: into half D: at half
内容
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This doll is<br/>about ______high. A: a half meter B: half a meter C: half meters D: half meter
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---What time do you expect me back, Mum? ---_____half an hour.
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Hehasbeenherefor_____________. A: one and the half months B: one and a half month C: one and a half months D: one and the half month
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It’s not a good habit to leave your work __________ . A: done half B: half done C: a half done D: done a half
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He doesn't act ______ Tom ______. A: as half strangely as B: so half strangely as C: half strangely as D: half so strangely as