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A pitch mesophase can be prepared from petroleum pitch andcoal tar pitch.
从石油沥青和煤沥青中制取沥青中间相物质。
A pitch mesophase can be prepared from petroleum pitch and coal tar pitch.
从石油沥青和煤沥青中制取沥青中间相物质。
Some smectic mesophase liquid crystal exhibit ferroelectric and pyroelectric properties.
某些碟状近晶相液晶具有铁电和热电性质。
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