一底面半径为的圆柱,被一平面所截剩下部分母线最大值为a,最小值为b,那么圆柱被截后剩下部分的体积为( )。
---What would you do if _________ eighty-year-old man fell down in front of you?
----I don’t know. Maybe I will help him.
A.a
B.an
C.the
D./
油品置换时,置换量的制订依据是()
A、罐付出量
B、罐收入量
C、管线内存油量
D、桶的灌装量