问题
选择题
Hearing his words, I couldn't decide ______ or remain.
A．whether to go abroad
B．if I go abroad
C．if to go abroad
D．to go abroad
答案
a
搜题请搜索小程序“爱下问搜题”
Hearing his words, I couldn't decide ______ or remain.
A．whether to go abroad
B．if I go abroad
C．if to go abroad
D．to go abroad
a
某原电池总反应为：Cu+2Fe3+═Cu2++2Fe2+，下列能实现该反应的原电池是（ ）
| A | B | C | D | |
| 电极材料 | Cu、Zn | Cu、Ag | Cu、C | Fe、Zn |
| 电解液 | FeCl3 | Fe2（SO4）3 | Fe（NO3）2 | CuSO4 |
A．A
B．B
C．C
D．D