【简答题】他们让我们提心吊胆了两个多小时。 They kept us in ___________for over two hours.
【简答题】在一个装有3个黄球和3个红球的袋子中摸球,每次摸3个球,摸到3个红球的可能性是______.
【简答题】袋中有大小相同的红、黄两种颜色的球各1个,从中任取1只,有放回地抽取3次. 求: (1)3只全是红球的概率; (2)3只颜色全相同的概率; (3)3只颜色不全相同的概率.
【单选题】What is aging?
A.
Aging is a genetically programmed process, playing itself out on a rigidly predetermined time schedule.
B.
a accumulation of random damage to the building blocks of life — especially to DNA, certain proteins, carbohydrates and lipids (fats) — that begins early in life and eventually exceeds the body’s self-repair capabilities.
【单选题】连接件的约束能力用联系数表示,链杆的联系数是( )。
【简答题】袋中有大小相同的红、黄两种颜色的球各1个,从中任取1只,有放回地抽取3次. 求: (1)3只全是红球的概率; (2)3只颜色全相同的概率; (3)3只颜色不全相同的概率.
【单选题】What is aging?
A.
Aging is a genetically programmed process, playing itself out on a rigidly predetermined time schedule.
B.
a accumulation of random damage to the building blocks of life — especially to DNA, certain proteins, carbohydrates and lipids (fats) — that begins early in life and eventually exceeds the body’s self-repair capabilities.
【简答题】某公司现金收支平稳,预计全年现金需要量为400 000元,现金与有价证券转换成本每次为200元,有价证券利率为10%。 要求: (1)计算最佳现金持有量; (2)计算最低现金管理成本、转换成本、持有机会成本; (3)计算有价证券交易次数、有价证券交易间隔期。
【简答题】某公司现金收支平稳,预计全年现金需要量为250000元,现金与有价证券的转换成本为每次500元,有价证券年利率为10%。 求:最佳现金持有量。