一个数是由6个一和4个十组成的,这个数是( )。
46
-We have finished watering all the trees, Miss Yang.
- , boys and girls. Let's have a drink. [ ]
A. Good luck
B. Well done
C. Congratulations
D. Best wishes
柴油机的调速性能是指其在调速器的作用下什么与什么的关系?