焊件焊后进行整体高温回火，既可以清除应力，又可以消除变形。
参考答案：错
They _____ 3000 English words by the end of next month. [ ]
A. learned
B. had learned
C. will learn
D. have learned
皮肤结核的特点，除外
A．狼疮结节
B．溃疡
C．脓庖、丘疹
D．瘙痒
E．瘢痕
