公称内径为100~200mm的管子,其碰伤长度限值为( )mm。
A.40~45B.50~60C.65~80D.85~105
参考答案:A
Not only _____ good about helping other people, but _ to spend time doing what I love to do. [ ]
A. do I feel; get I
B. do I feel; I get
C. I do feel; get I
下述哪种物品最适宜由市场来提供()。
A.教育
B.卫生
C.粮食
D.住房