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SAT官方每日一题附答案和解析[数学](2018年11月1日)

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Mathematics

During the process of radioactive decay, a "parent" material produces a new "daughter" material, which further decays into a stable material. During an experiment involving radioactive decay, the mass M, in micrograms, of daughter material changes over time t, measured in hours as shown in the graph above. What is the significance of the point shown on the graph?

SAT官方每日一题附答案和解析[数学](2018年11月1日)

A.The point shows the mass of the daughter material at the beginning of the experiment.
B.The point shows the mass of the daughter material when the mass was increasing at its fastest rate.
C.The point shows the amount of time the daughter material takes to decay into stable material.
D.The point shows the maximum mass of the daughter material and the number of hours since it was created that its mass reached this maximum.

重点单词   查看全部解释    
substance ['sʌbstəns]

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n. 物质,实质,内容,重要性,财产

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decay [di'kei]

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v. (使)衰退,(使)腐败,腐烂
n. 衰退

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measured ['meʒəd]

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adj. 量过的,慎重的,基于标准的,有韵律的 动词me

 
stable ['steibl]

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adj. 稳定的,安定的,可靠的
n. 马厩,

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graph [grɑ:f]

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n. 图表,示意图
vt. (以图表)表示

 
mass [mæs]

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n. 块,大量,众多
adj. 群众的,大规模

 


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