【简答题】Ⅰ.下列有关实验操作中,合理的是_____(填序号)。 A.用托盘天平称取11.70 g食盐 B.用量筒量取12.36 mL盐酸 C.用酸式滴定管量取21.20 mL 0.10 mol/L H2SO4溶液 D.用200 mL容量瓶配制500 mL 0.1 mol/L NaCl溶液 E.测定溶液的pH时,用洁净、干燥的玻璃棒蘸取溶液,滴在用蒸馏水润湿过的pH试纸上,再与标准比色卡比较 Ⅱ.现用物质的...
【单选题】---Is it possible for you to lend me your car for a week? ---_______! You haven’t got your driving license yet!
【简答题】Which of the following signs means 'You mustn't stop your car here'? [ ]
【简答题】进行化学实验时必须要有规范、安全意识。下列做法错误的是( ) A用托盘天平称量样品时,左盘放物品,右盘放砝码 B容量瓶在使用之前应先检查是否漏液 C.蒸馏装置中,冷凝水的方向是下口进水,上口出水 D在实验室中检验蔗糖、加碘食盐,可各取少量分别放在口里品尝一下
【简答题】How often do you use your car? Can you use your car less often? Do you know the following facts in the UK? ? About 50% of all car journeys are just for fun. ? Over 80% people go to work by car. ? 25% ...
【简答题】(4分)下列实验操作中不正确的是______________(填序号)。 A.用托盘天平称取11.70g食盐 B.利用任何强酸和强碱溶液相互反应均可测得中和热为57.3kJ/mol C.用量筒量取12.36mL盐酸 D.用酚酞作指示剂进行中和滴定时,当溶液由无色变为红色时立即停止滴定 E.用酸式滴定管盛装高锰酸钾溶液进行相关滴定。
【简答题】How often do you use your car? Can you use your car less often? Do you know the following facts in the UK? ? About 50% of all car journeys are just for fun. ? Over 80% people go to work by car. ? 25% ...