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1.市場(chǎng)上供應(yīng)的燈泡中，甲廠產(chǎn)品占70%，乙廠占30%，甲廠產(chǎn)品的合格率是95%，乙廠產(chǎn)品的合格率是80%，則從市場(chǎng)上買(mǎi)到一個(gè)是甲廠生產(chǎn)的合格燈泡的概率是　　　 .

答案　 0.665

試題詳情

35．The man was observed　　　 into the manager’s office and help himself to everything valuable．

A．slip　　 B．slipping　　 C．to slip　　 D．slipped

試題詳情

34．How disappointed the students were when　　 that their English teacher would not came to their English evening!

A．informing　　 B．informed　 C．being informed　 D．to be informed

試題詳情


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