(6分) 下列试剂中,标签上应标注 和 的是( )
Answer key
B
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(6分) 下列试剂中,标签上应标注 和 的是( )
B
(6分)下列金属中,表面自然形成的氧化层能保护内层金属不被空气氧化
的是( )
D
(6分)下列电池工作时,O 2 在正极放电的是( )
B
(6分)下列解释事实的方程式不正确的是( )
C
(6分)下列说法正确的是( )
A
中档题为主
铝单质与铝热反应
单选 5
中档 5
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