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问题 单项选择题

生活史中只有滋养体阶段的原虫是（）

A.溶组织内阿米巴

B.杜氏利什曼原虫

C. * * 毛滴虫

D.结肠内阿米巴

E.疟原虫

答案

参考答案：C

单项选择题

PRODUCT CATALOGUE

Art.NoCommodityTins per case Net weight/per tin
C301Sliced Pork 60170
C302Stewed Pork36350
C303Curry Beef 60201
C304Stewed Pork Ribs36350

A. Curry Beef in a case is not as heavy as Sliced Pork. B. There are more tins in a case for Stewed Pork Ribs than Stewed Pork. C. One case of Stewed Pork Ribs is heavier than one case of Sliced Pork.
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填空题

关系数据库的关系演算语言是以______为基础的DML语言。
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