SEM images indicate that the morphologies of tunnel pits are transformed from the shape like as a cone to a baseball bat after adding PSSA.

隧道孔由孔口大、孔内小的“锥子”状转变为孔口小、孔内大的“垒球棒”状。

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SEM images indicate that the morphologies of tunnel pits are transformed from the shape like as a cone to a baseball bat after adding PSSA.

隧道孔由孔口大、孔内小的“锥子”状转变为孔口小、孔内大的“垒球棒”状。

youdao