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设某种动物由出生而活到 20 岁的概率为 0.8 ,活到 25 岁的概率为 0.4 ,问现年龄为 20 岁的这种动物活到 25 岁的概率为
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【单选题】考试题型4: 阅读理解。 通常情况4个选项 Understanding difficult sentences Choose the answer that correctly interprets the sentence from the text. The reason energy and water sit at the top, ahead of food and poverty, i...
A.
Energy and water are the top two problems on the list. The reason is that if we start to solve these problems, the other problems that follow them on the list, such as food and poverty, will be easier to deal with.
B.
Energy and water are listed as the two problems more important than food and poverty. This is because once we start working on them, addressing food shortage and poverty will be easier later on.
【单选题】甲技师说:液 力变矩 器和机械传动 的效率可 达 9 5% -9 7% 。乙技 师说:液力变矩 器最南传动 效率 般只有 8 2%- 8 6 % 左右 而机械传 动 的效丰可达 9 5 % -9 7% 所 以装备液力变矩器 自动 变速器 的车辆 比装备手动变速器的车辆 的经 济性有所降低 你认 为( )
A.
仅 甲正确
B.
仅乙 正确
C.
甲和乙 都正 确
D.
甲和乙 都不 正确
【简答题】讨论下列反常积分的敛散性： (3) (4) (6)
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