A.K3PO4和K3P B.KH2PO4和PH3 C.KH2PO3和K3P D.KH2PO2和PH3
A.放在水中 B.放在CS2中 C.放入棕色玻璃瓶 D.放入棕色塑料瓶
A.180° B.120° C.108.5° D.60°