一位国王的铸币大臣在每箱100枚的硬币中各掺入了一枚劣币，国王_爱下问搜题

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问题选择题

一位国王的铸币大臣在每箱100枚的硬币中各掺入了一枚劣币，国王怀疑大臣作弊，他用两种方法来检测，方法一：在10箱中各任意抽查一枚；方法二：在5箱中各任意抽查两枚．国王用方法一、二能发现至少一枚劣币的概率分别记为p₁和p₂，则 [ ]

A．p₁=p₂

B．p₁＜p₂

C．p₁＞p₂

D．以上三种情况都有可能

答案

答案：B

补全对话，情景问答

给下列的问句选择合适的答语。

( ) 1. What are they eating?
( ) 2. What do you have?
( ) 3. What are you doing?
( ) 4. What colour is that?
( ) 5. What do monkeys like to eat?

A. They like to eat bananas.
B. It's purple.
C. They are eating the honey.
D. I'm making a cake.
E. I have a red bike.

问答题简答题

简述旋压密封式制动缸的作用原理。