看拼音,写词语。
chí tang
gǎn kuài
hǎo xiàng
lán tiān
____
piāo zhe
àn biān
diàn bào
wǎng xià luò
yùn dòng chǎng
昼夜更替产生的原因是( )
为探究Zn和Cu的金属活动性强弱,提供的试剂有:Zn、Cu、H2SO4溶液、ZnSO4溶液、CuSO4溶液。下列说法正确的是()
— I don't know, either. But we should do our work better.