大家看,这4瓶气体是氢气、氧气、一氧化碳和二氧化碳,可是没有标签,我们该怎么鉴别?
dàjiā kàn ,zhè sì píng qìtǐ shì qīngqì 、yǎngqì 、yīyǎnghuàtàn hé èryǎnghuàtàn ,kěshì méiyǒu biāoqiān ,wǒmen gāi zěnme jiànbié ?
Look, everyone. These four vials of gas hold hydrogen, oxygen, carbon monoxide, and carbon dioxide. But they aren't labeled, so how do we distinguish them?