—Excuse me, sir, there is _____ tea in your cup, would you like some more? —Yes, please. And give me _____ mooncake. It tasted delicious.
A:few, other
B:a few, another
C:little, another
D:a little, other
工厂排放的废水中含有硫酸铜、硫酸亚铁和硫酸锌.同学们想从废水中回收硫酸锌和金属铜.设计了如下实验过程:
请回答下列问题:
.
如图所示,如果电流计偏转,a变粗,b变细,符合这一情况的是( )