A. doctor B. nurse C. teacher D. farmer E. singer F. writer
⑴ ____ ⑵ ____
⑶ ____ ⑷ ____
⑸ ____ ⑹ ____
装置工作时往往伴随能量的转化.下列四组连线中,错误的是( )
读下面的等高线地形图,完成下题.