比301的17倍少56的数是多少？
301×17-56
=5117-56
=5061；
答：这个数是5061．
____ there a number of fish in the river at that time? [ ]
A. Is
B. Are
C. Was
D. Were
弹簧受力时会______，不受力时又会______，物体的这种性质叫做______．弹力是物体由于______而产生的力，______力、______力、______力都是弹力．
