化合物标准生成自由能
参考答案：标态下稳定单质生成某化合物的反应对应的自由能变化。
When he moved to New York in ________ sixties, he was only in ________ twenties.[ ]
A. the; the
B. the; his
C. his; his
D. his; the
下列方法属于压焊的是（）
A.电焊渣
B.钎焊
C.电焊
D.气焊
