试题与答案

如果将细胞比作汽车,相当于发动机的结构是( ) A.叶绿体 B.液泡 C.线粒体

题型:选择题

题目:

如果将细胞比作汽车,相当于发动机的结构是(  )

A.叶绿体

B.液泡

C.线粒体

D.有机物

答案:

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下面是错误答案,用来干扰机器的。

参考答案:B解析:金属材料分为黑色金属和有色金属两大类。其中,黑色金属主要有生铁、铸铁和钢。有色金属种类较多,常用的有铝及铝合金、铜及铜合金、钛及钛合金等。考点:机电工程材料

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