题目内容
Why is there no need to panic about eating chicken according to a WHO official?
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Why should poultry meat and eggs be properly cooked before consumed？
Do people run the risk of getting the virus through handling or eating poultry where thereis no bird flu outbreak?
What precautionary measures should people take when they slaughter and handle diseasedor dead birds in affected areas?
一盒子中有4只坏晶体管和6只好晶体管,在其中取二次,每次随机取一只,(取后不放回)若已知第一只取到是好的则第二只也是好的概率是 _______.
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