把a、b、c、d四种金属浸入稀硫酸中,用导线两两相连可以组成各种原电池。若a,b相连,a为负极;c、d相连,d上有气泡溢出;a,c相连,a质量减少;b,d相连,b为正极。则四种金属的活动性顺序由大到小为( ) A . B . C . D . 答案:B
从所给的四个选项中选择最佳答案
Jiangsu is _________ the east of China, but Japan is
________ the east of China.
[ ]
A.to; in
B.in; to
C.on; to D.on; in