利用如图，选择以下合适的药品，可以实现“随开随用，随关随停”的是

题干

利用如图，选择以下合适的药品，可以实现“随开随用，随关随停”的是（　　）

A：石灰石和稀硫酸制二氧化碳

B：大理石和稀盐酸制二氧化碳

C：双氧水和二氧化锰制氧气

D：碳酸钠和稀盐酸制二氧化碳

上一题下一题 0.0难度选择题更新时间:2019-03-30 11:55:54

B

短文判断。根据短文内容，在表中相应方框内写正确。

My friend is Mike. He is a boy. He is tall. He has strong. He has short hair. He is very active and likes sports.

Amy is his friend. She is a girl. She is short and thin. She has long hair. She is quiet. She likes painting.

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