158. He is fond of playing ____ piano while his br

158. He is fond of playing ____ piano while his brother is interested in listeni

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说维生素D是甾醇衍生物的原因是A.具有环戊烷氢化菲的结构B.光照后可转化为甾醇C.由甾醇B环开环衍生

说维生素D是甾醇衍生物的原因是A.具有环戊烷氢化菲的结构B.光照后可转化为甾醇C.由甾醇B环开环衍生而得D.具有甾醇的基本性质

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[填空题,2分] 纹孔对具有一定的形态和结构,常见的有________、半具缘纹孔和单纹孔三种类型。

[填空题,2分] 纹孔对具有一定的形态和结构,常见的有________、半具缘纹孔和单纹孔三种类型。

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109. Although he did no know London well, he made

109. Although he did no know London well, he made his way _____ to the airport.

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