一般物体都有热胀冷缩的性质.在相同的受热条件下铜的膨胀程度比铁的膨胀程度大.将两个形状厚度相同的铜片和铁片铆在一起就可制成双�属片如图甲 Template




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tomski一般物体都有热胀冷缩的性质.在相同的受热条件下铜的膨胀程度比铁的膨胀程度大.将两个形状厚度相同的铜片和铁片铆在一起就可制成双�属片如图甲 coloring