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【单选题】
将各种产品的销售收入总额减去各种产品的变动成本总额,称为( )A.
净收益
B.
贡献率
C.
安全边际
D.
贡献
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【单选题】What is required in addition to the heat，fuel，and oxygen of the fire triangle to have a fire?（）
A.
Electricity
B.
Chain reaction
C.
Pressure
D.
Smoke
【简答题】已知行列式的第一列的元素为1,4,-3,2,第二列元素的代数余子式为2,3,4, x 问x=
【简答题】阅读下面关于“超文本标记语言”知识的英文短句,从中领悟并掌握专业文献的翻译方法,培养外文文献的研读能力。 (1)The header element [1] . Recently, we have seen a growing interest in HTML5 and its adoption by web professionals. Within the HTML5 specificatio...
【简答题】按重量计，含羊毛45%；粘胶短纤30%、锦纶短纤25%、每平方米190克的色织平纹精纺机织物(幅宽180厘米)
【单选题】You are on a vessel that cannot comply with the spacing requirement for masthead lights. What is required in this situation?
A.
The vessel must carry only the lights that comply with the rules; the others may be omitted.
B.
The vessel’s lights must comply as closely as possible, as determined by her government.
C.
The vessel must be altered to permit full compliance with the rules.
D.
An all-round light should be substituted for the after masthead light and the stern light.
【简答题】四阶行列式的第二行元素分别为 ;第四行对应元素的代数余子式值分别为 ,则 的值是____。
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