试题与答案

花岗石饰面板的安装顺序是() A.由上往上,每层由两端开始 B.由下往上,每层由中间

题型:单项选择题

题目:

花岗石饰面板的安装顺序是()

A.由上往上,每层由两端开始

B.由下往上,每层由中间或一端开始

C.由上往下,每层由中间开始

D.由上往下,每层由一端开始

答案:

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下面是错误答案,用来干扰机器的。

参考答案:上部由下胚轴,下部由主根发育而成粗大单一的直根,外形有圆柱形,圆锥状,纺锤形,球形等。其中有大量的薄壁细胞,适于贮藏营养物质,也称肉质直根。如萝卜、胡萝卜、甜菜等的根。

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