常见例句双语例句It was found that coal tar pitch could not be used as-received to prepare useful carbon foams because of their higher quinoline insoluble (QI) fraction.结果发现，由于煤焦油沥青不含中间相，且QI含量较高，导致在实验条件下不能直接制备出合格的炭泡沫。 返回 insoluble tar