... litho printings 石版印刷纸 litho operation 平版印刷 litho stone 石印石 ...
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Red sand stone is low or medium rock strain in strength, variable and complicated in litho - facies, and easily weathered or weakened.
红砂岩为中低强度岩层、岩相复杂多变，较易风化、软化。
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