薄型硬木地板粘贴的工艺顺序为：施工准备→弹线→垫基层板→粘贴硬木地板→养护→刨光或磨光。
参考答案：对
So difficult it to work out the problem that I decided to ask Tom for advice. [ ]
A. I did find
B. did I find
C. I have found
D. have I found
起重电磁铁的冷态绝缘电阻应大于（）兆欧。
A、5
B、10
C、2
