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【单选题】
表示化学反应速率用 ( )A.
单位时间内反应物质量的减少或生成物质量的增加
B.
单位时间内反应物体积的减少或生物体积的增加
C.
单位时间内反应物浓度减少或生成物浓度的增加
D.
单位时间内反应物重量的减少或生成物重量的增加
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反馈参考答案：
举一反三
【简答题】测量的有效性,又称 ,是指所选择的测量手段在测量欲测量属性时的准确性程度,即为所测量的属性与欲测属性之间的一致性程度。
【单选题】equal marginal principle is
A.
Principle that utility is maximized when the consumer has equalized the marginal utility per dollar of expenditure across all goods.
B.
Principle that utility is maximized when the consumer has equalized the total utility per dollar of expenditure across all goods.
C.
Principle that as more of a good is consumed, the consumption of additional amounts will yield smaller additions to utility.
D.
Principle that as more of a good is consumed, the consumption of total amounts will yield smaller additions to utility.
【单选题】When a hurricane is about to occur, the National Weather Bureau issues a warning.
A.
adjacent
B.
gigantic
C.
perilous
D.
imminent
【简答题】扇形原则(sector principle)
【单选题】Which of the following is NOT the principle of designing tasks?
A.
The authenticity principle
B.
The form-function principle
C.
The task independency principle
D.
Learning by doing principle
【简答题】Obama met with leaders, talking about all the following issues EXCEPT __________． [A] trade [B] climate change [C] world economy [D] local finance
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