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同时抛掷3枚均匀的硬币，则恰好有两枚正面朝上的概率为（ ）
同时抛掷3枚均匀的硬币，则恰好有两枚正面朝上的概率为（ ）
自考公共课
数据帝
2023-11-22
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题目：同时抛掷3枚均匀的硬币，则恰好有两枚正面朝上的概率为（ ）
A．0.125 B．0.25
C．0.375 D．0.50
喵查答案：
C
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A. cross
As the plane circled over the airport，everyone sensed that something was wrong. The plane was moving unsteadily through the air，and although the passengers had (11) their seat belts，they were suddenly (12) forward. At that moment，the air-hostess appeared. She looked very pale，but was quite calm. (13) quickly but almost in a whisper，she informed everyone that the pilot had fainted and asked (14) any of the passengers knew anything about machines or at least how to drive a car. (15) a moment’s hesitation，a man got up and followed the stewardess(空中小姐)into the pilot’s cabin.
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