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【单选题】
In order for a cell to carry out its biologic functions, the intracellular reactions need to be directed to follow a certain pathway. Which one statement best describes the direction a chemical reaction will follow?A.
A reaction with positive free energy will proceed in the forward direction if the substrate concentration is raised high enough.
B.
Under standard conditions, a reaction will proceed in the forward direction if the free energy Δ G0 ′ is positive.
C.
The direction of a reaction is independent of the initial substrate and product concentrations because the direction is determined by the change in free energy.
D.
The concentration of all of the substrates must be higher than that of all of the products for the reaction to proceed in the forward direction.
E.
The enzyme for the reaction must be working at >50% of its maximum efficiency for the reaction to proceed in the forward direction.
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举一反三
【判断题】企业所得税法规定,接受捐赠收入,是指企业接受的来自其他企业、组织或者个人无偿给予的货币性资产、非货币性资产。接受捐赠收入,按照实际收到捐赠资产的日期确认收入的实现。( )
A.
正确
B.
错误
【单选题】患者,男性,66岁,因进行性吞咽困难收入院,诊断为食管癌。护士收集健康史中,哪项可能与其患病有关
A.
平时喜吃烫的食物
B.
喜食疏菜
C.
偶尔饮酒
D.
不吸烟
E.
很少参加运动
【多选题】以下水泥安定性检测结果判定中叙述正确的是()。
A.
当两个试件煮后增如距离 (C-A) 的值大于 5.0mm 时 , 该水泥安定性不合格
B.
当两个试件煮后增加距离 (C-A) 的平均值不大于 4.0mm 时 , 该水泥安定性合格
C.
当两个试件煮后增加距离 (C-A) 的差值大于 5.0mm 时 , 该水泥安定程不合格
D.
当两个试件煮后增加距离 (C-A) 的差值大于 4.0mm 时 , 该用同一样品立即重做
E.
当两个试件煮后增加距离 (C-A) 的差值超过 4. 0mm 时，该水泥安定性不合格
【简答题】现阶段AQI的评价参数有哪些?
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