The lowest courses of flint are blackest and rough hewn with large gallets in black mortar joints.
底层的燧石颜色最深，由大块碎石融入黑色砂浆做成。
Research of the nano carbon black cement mortar electrical and electrothermal properties.
研究了纳米炭黑水泥砂浆的导电性和电热特性。
Research of the nano carbon black cement mortar electrical and electrothermal properties.
研究了纳米炭黑水泥砂浆的导电性和电热特性。
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