While many states have adopted standards requiring that a certain amount of energy come from renewable sources, Congress has yet to enact a nationwide standard.
虽然许多国家都采用的标准要求一定量的能源来自可再生能源，美国国会尚未制定全国性的标准。
“The only issue on the table with a very short amount of time is what to do with the expiring tax cuts, ” Feldsein says, “not what more general policy might be adopted.”
费德斯登表示：“现在摆在台面上唯一的问题在如此短的时期内，将要废除的税减政策该何去何从，而不是再制定一些华而不实的其他政策。”
In the experiment, single-factor analysis was adopted and the influence of the amount of benzoic acid and solvent and the reaction time on the organic con- tent in bentonite was studied.
采用单因素分析方法，考察苯甲酸用量、分散剂用量、反应时间等因素对苯甲酸有机膨润土有机物含量的影响。
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