在一般性地区，如果土壤电阻率大于（）Ω﹒m范围内，即认为该地区腐蚀性较弱。
A.20
B.30
C.40
D.50
参考答案：D
It was patent_______everyone that he disliked the idea. [ ]
A. on
B. for
C. to
D. as
润滑油粘度高是否说明润滑油质量好。
