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【单选题】
在一项研究的最初检查中,人们发现30~44岁男女两组人群的冠心病患病率均为4%,于是,认为该年龄组男女两性发生冠心病的危险相同。这个结论()
A.
正确的
B.
不正确的,因为没有区分发病率与患病率
C.
不正确的,因为用百分比代替率来支持该结论
D.
不正确的,因为没有设立对照组
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【判断题】Historians believe the story of the American nation and its culture begins with the 1492 discovery of the new world by English explorer Christopher Columbus.
A.
正确
B.
错误
【判断题】细菌细胞内的颗粒状贮藏物是不同化学成分累积而成的不溶性沉淀颗粒,其主要功能是贮存代谢废弃物。
A.
正确
B.
错误
【单选题】有关细菌内含物不正确的是()。
A.
细菌核糖体由 65% 核糖核酸和 35% 蛋白质组成的颗粒体。由 50S 大亚基和 30S 小亚基组成80S的核糖体。
B.
细胞内含物( inclusion body ,贮藏物)指细胞质内一些形状较大的颗粒状构造
C.
贮藏物是 一类由不同化学成分累积而成的不溶性颗粒,主要功能是贮存营养物
D.
不同微生物其储藏性内含物不同
【简答题】The first known and sustained contact between the Americas and the rest of the world,however,began with the famous voyage of an_________explorer,Christopher Columbus,funded by the Spanish rulers Ferdi...
【判断题】Columbus Day is especially popular for Italian American because Christopher Columbus who first discovered Americas is an Italian explorer.
A.
正确
B.
错误
【判断题】Columbus Day is especially popular for Italian American because Christopher Columbus who first discovered America is an Italian explorer
A.
正确
B.
错误
【单选题】The American Continent was discovered by Christopher Columbus but was named after ________ another explorer.
A.
Marco Polo
B.
Christopher Columbus
C.
Ferdinand Magellan
D.
Amerigo Vespucci
【判断题】Columbus Day is especially popular among Italian Americans because Christopher Columbus who first discovered America is an Italian explorer.
A.
正确
B.
错误
【判断题】Christopher Columbus was an explorer, colonizer, and navigator.
A.
正确
B.
错误
【判断题】Columbus Day is especially popular for Italian American because Christopher Columbus who first discovered Americas is an Italian explorer.
A.
正确
B.
错误
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