问题
单项选择题
| 市场供应的电磁炉中，甲厂产品占60%，乙厂产品占30%，丙厂产品占10%，甲厂产品合格率为95%，乙厂产品合格率为90%，丙厂产品合格率为80%。则 |
买到的电磁炉是乙厂生产的合格品的概率为______。
A．0.92
B．0.08
C．0.27
D．0.57
答案
参考答案：B
解析：
P(BA2)=P(A2)P(B|A2)=0.27。
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| 市场供应的电磁炉中，甲厂产品占60%，乙厂产品占30%，丙厂产品占10%，甲厂产品合格率为95%，乙厂产品合格率为90%，丙厂产品合格率为80%。则 |
买到的电磁炉是乙厂生产的合格品的概率为______。
A．0.92
B．0.08
C．0.27
D．0.57
参考答案：B
解析：
P(BA2)=P(A2)P(B|A2)=0.27。
| 阅读下面的短文，根据其内容从所给的12个单词或短语中选择10个，并以其适当的形式填空。 | |
home. There are so many (2)________ books there. Each one has its (3)________ secrets. Each one has (4)________ to teach and share. Some (5)________ beautiful pictures. (6)________ have interesting stories. To Lucy, books are (7)________ her good friends. At the library, Lucy has friends (8)________ around her. Lucy is always ready to help people, (9)________ the staff at the library all like her. They help (10)________ choose books for the readers. |