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[求助]
請(qǐng)幫忙斟酌下這兩句話(huà)是何意思
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Watch the thermometer and turn off the heat when the temperature reaches 90℃ . Slowly add muriatic acid in small doses over a 2-hour period. Watch the top of the condenser for signs things are getting out of hand. Once all of the acid has been added, allow the stirring to continue for another 2 hours before going on to the next step. 尤其是第一句 是不是觀察溫度 達(dá)到90攝氏度時(shí)候就關(guān)閉電源???? 不解求指點(diǎn) [ Last edited by 飄落江南 on 2013-2-18 at 18:07 ] |

木蟲(chóng) (著名寫(xiě)手)

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