英语语法分析

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。