埋弧焊在焊接位置方面仅适用于平焊和平角焊。
参考答案:对
John thinks it won't be long ____ he is ready for his new job. [ ]
A. when
B. after
C. before
D. since
报社开展多种经营活动要遵循多项原则,其中第一个原则是首先要精心搞好报社的__________。