问题
选择题
| Australia is one of the few countries _____ people drive on the left. |
A. which B. when C. where D. that |
答案
答案：C
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| Australia is one of the few countries _____ people drive on the left. |
A. which B. when C. where D. that |
答案：C
下列各组物质中，物质之间通过一步反应就能实现如图所示转化的是( )
| 编号 | a | b | c | d |
| ① | Na2O | Na2O2 | Na | NaOH |
| ② | Al2O3 | NaAlO2 | Al | Al(OH)3 |
| ③ | FeCl2 | FeCl3 | Fe | CuCl2 |
| ④ | NO | NO2 | N2 | HNO3 |
A．①② B．②③ C．②④ D．①③