清晨收集痰标本，查痰中致病菌的原因是 ( )A．痰内无杂质B．痰液易咳出C．痰内细菌多D．痰量多E．便于操作

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问题清晨收集痰标本，查痰中致病菌的原因是 ( )

选项 A．痰内无杂质 B．痰液易咳出 C．痰内细菌多 D．痰量多 E．便于操作

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