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。