Beichuan-Yingxiu fault was weakly thrusted in the early stage and was deformed in the late stage. Anxian-Dujiangyan Dam fault was deformed. Thrust plane developed well in the nappe, which was thrusted from NW to SE.

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Culm sheaths yellow-green or pale red-brown, becoming straw-colored, with variably sized brown spots, base edged with white pubescence; auricles and oral setae absent; ligule yellow-green, truncate or weakly convex at apex, very short, 1–2 mm, margin longer pale green ciliate; blade reflexed, green, with yellow margins, linear, flat or crinkled in upper sheaths.

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Silver grass is weakly acidic, pH value is between 5.53 and 6.49, alkali buffer capacity is between 0.89ml and 3.31ml and acid buffer capacity is between 11.52ml and 17.38ml; To the wet ability of silver grass, the under-parts of stem are better than upsides, the inner surface of stem is better than surface, the wet ability of leaf is between surface and inner surface; compare with wood and wheat straw, the wet ability of silver grass is worse than that of wood but better than that of wheat straw.

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Weakly acidic food: white rice, peanut, beer, alcohol, oil fried tofu, sea weed, clam, octopus

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