题目内容
(4) , practicality seems like an enemy of great gift giving. Beautiful jewelry, lovely watches, perfect rugs, finely crafted kitchen hardware: These things(5) great gifts because they communicate something beyond practicality. Theycommunicate that the giver cares.
But do the receivers care？ Often,no. "Gift receivers would be (6) ifgivers gave them exactly what they requested (7) . attemptingto be&39;thoughtful and considerate&39; by buying gifts they did not explicitly request" to surprisethem, the researchers write. Their clever paper asks givers and receivers to (8) gifts from two perspectives: desirability (e.g. the cost of a coffee maker) and feasibility(e.g. the (9) of the coffee maker).Across several experiments, theyfind that givers consistently give gifts based on desirability and receivers (10) favor gifts based on feasibility .
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煤炭建设井巷工程消耗量定额》(2007基价)总说明第二十八条规定：本定额斜井(巷)、平硐(巷)及硐室掘进定额是按爆力为320cm3的硝胺炸药制定的，使用不同爆力的炸药时，可按下列炸药爆力系数调整定额炸药使用量：(5分)
Q1=eQ0
e=320/V
式中： Q1——调整后定额炸药用量， kg
Q0——定额硝胺炸药用量，kg
e ——炸药爆力系数;
320——定额采用硝胺炸药的爆力，cm3;
V——施工采用水胶炸药的爆力，cm3
现已知一巷道掘进套用的定额子目为2192，定额中硝铵炸药的消耗量为154kg，实际施工中采用暴力为220 cm3的乳化炸药，现要掘进该巷道920m3，请计算所需乳化炸药的定额消耗量。
对于吉芬商品而言，当价格下降时，替代效应和收入效应的关系是_____________.
《煤炭建设井巷工程辅助费综合定额》(2007基价)是按海拔小于+2000m 制定的，大于此海拔时以 （） 系数调整定额。
RS—232C的电气特性规定逻辑“0”的电平为（）
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