A:①H2O2②H2O③O2
B:①Na2CO3②CO2③CaCO3
C:①CaCO3 ②CO2 ③Ca(OH)2
D:①C②CO③CO2
(C)
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下列性状中,属于一对相对性状的是。
如图甲是“探究杠杆的平衡条件”的实验装置: