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翻译以下段落。(英翻中) Today, Google has become a multinational corporation in Internet-related services and products. These include search, cloud computing, software, and online advertising technologies. And it's the leader in terms of ad-based revenue on the web. The brain child of two students has become a billion-dollar company and one of the best-known trademarks in the world. Google's history serves as a perfect model and inspiration for Internet entrepreneurs today.

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【单选题】食管贲门失弛缓症与食管下段癌的鉴别要点是()

A.
狭窄上方食管明显扩张
B.
食管蠕动减弱或消失
C.
狭窄段黏膜完整,管壁柔软
D.
钡剂通过缓慢
E.
扩张食管内出现液平

【单选题】食管中下段局限性不规则收缩,称为()

A.
第一蠕动波
B.
第二蠕动波
C.
第三收缩波
D.
第四收缩波
E.
第五收缩波