Safetymustcomefirst.Duringthecomingsummervacation,someo...
问题详情:
Safety must come first. During the coming summer vacation, some of us may travel to other places. To keep safe during the journey, we should ..
①avoid eating raw(生的)and cold food
②obey the local traffic rules
③swim in the dangerous area
④never stretch our hands out of the window when taking a bus
⑤ tell strangers our personal information
A.①③⑤ B. ②④⑤ C.①②④
【回答】
C
知识点:其他
题型:选择题
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蜡烛燃烧刚熄灭时产生的白*是什么?提出问题:蜡烛刚熄灭时,总会有一缕白*冒出,它的成分是什么呢?猜想与假设:A...
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下列与实验相关的叙述正确的是 A.稀释浓硫*时,应将蒸馏水沿烧杯内壁缓慢地注入浓硫*中B.配制溶液时,若加水...
问题详情:下列与实验相关的叙述正确的是 A.稀释浓硫*时,应将蒸馏水沿烧杯内壁缓慢地注入浓硫*中B.配制溶液时,若加水超过容量瓶刻度,应用胶头滴管将多余溶液吸出C.配制1mol·L-1300mLNaCl溶液可以选择一个50mL的容量瓶和一个250mL的容量瓶D.可以用右图装置进行*气的...
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