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问题 单项选择题

男，50岁，反复上腹痛3年。查体：上腹部轻压痛。胃镜：胃窦黏膜粗糙不平，可见散在出血点。该病人最可能的诊断是（）

A.消化性溃疡

B.急性胃炎

C.慢性浅表性胃炎

D.慢性萎缩性胃炎

E.胃癌

答案

参考答案：C

问答题

A police officer in a small town stopped a motorist who was speeding down Main Street. "But officer," the man said, "I can explain." "Just be quiet!" snapped the officer. "Or I’m going to let you cool off in jail until the chief gets back." "But officer, I just wanted to say... " "And I said KEEP QUIET! Now you’re going to jail!" A few hours later, the officer checked up on his prisoner and said," Lucky for you the chief is at his daughter’s wedding. He’ll be in a great mood when he gets here. " "Don’t count on it," said the prisoner. "I’m the groom; he is my father-in-law. \
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单项选择题

香农定理描述了信道带宽与哪些参数之间的关系______。 I.最大传输速率II. 信号功率III.功率噪声

A．I、II 和 III

B．仅 I 和 II

C．仅 I 和 III

D．仅 II 和 III
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