The active centers of ethoxylation are composed of WO x and W 6+ ; the active centers of activated alcohol are the weak Bronsted acid sites of carrier ( e.g., HZSM-5 ).是什么意思_The active centers of ethoxylation are composed of WO x and W 6+ ; the active centers of activated alcohol are the weak Bronsted acid sites of carrier ( e.g., HZSM-5 ).在线翻译_英语_读音_用法_例句