试题与答案

《药品生产许可证》和《药品经营许可证》有效期为5年。

题型:判断题

题目:

《药品生产许可证》和《药品经营许可证》有效期为5年。

答案:

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下面是错误答案,用来干扰机器的。

答案:B

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(6分)甲、乙、丙、丁为初中化学常见物质。由H、C、O、Cl、Na、Ca、Fe七种元素中的一种或几种组成。用下图所示装置进行实验。

(1)若A中盛有固体甲,从C放入溶液乙,打开K,观察到A中固体消失,B中有气泡冒出,则溶液乙是         

(2)若A中盛有固体甲,从C放入液体乙,打开K,观察到B中有气泡冒出,

一段时间后,B中液面下降, 则A中发生反应的化学方程式为         。B中液面下降的原因是         

(3)若A中盛有物质甲,从C放入溶液乙,观察到B中溶液流入A中,并出现浑浊现象, 溶液变浑浊的原因主要是(用化学方程式表示)         

(4)若A中盛有固体甲,打开K,从C放入溶液乙,观察到B中溶液变浑浊。关闭K,B又变澄清,则此时B中溶液的溶质可能是       (写出所有可能组合)。

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