A.
B.
C.
D.
答案:B
It ______ me five minutes to walk to school. [ ]
A. spends
B. takes
C. costs
D. has
油压装置压油槽工作时其内应充油和压缩空气,油约占总容积的()。
A.1/2左右;
B.1/4左右;
C.1/3左右;
D.2/3左右。