下列做法符合科学常识的是_刷题宝

题干

下列做法符合科学常识的是（　　）

A：与灯泡串联的开关安装在火线上

B：稀释浓硫酸时，把水直接倒入浓硫酸中

C：用金属容器盛装食物，放在微波炉中加热

D：用测电笔辨别火线与零线时，手不接触笔尾金属体

上一题下一题 0.0难度选择题更新时间:2019-12-04 02:52:39

答案(点此获取答案解析）

A

同类题1

阅读理解。

My parents

My parents work in a show factory. They get up at five thirty. They first get breakfast ready. Then they go to work by bus. They work there from eight to five. They come home at about six and prepare supper for us. Mother washes clothes in the evening. Father often makes toys for us. They are busy all day.

仔细阅读，判断句子正误。

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毒品是全球性公害，是人类共同的敌人。从组成和结构认识罂粟碱正确的叙述是( )

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The way________ he looks at problems is wrong.

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²³⁰Th和²³²Th是钍的两种同位素，²³²Th可以转化成²³³U．下列有关Th的说法正确的是（）

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