在()里填上合适的数。:r:T(x,\4p+q
4000米=:i9P-G;n'M5T7p1W;T8s:N千米:r:T(x,\4p+q
7分=/}*M0t5E:B-R/G5o:~4D.Q秒:r:T(x,\4p+q
7吨=9w(@*B2|(z-q0e0S;_-n9z-S千克:r:T(x,\4p+q
50厘米=4V7Y0W/A:g.G:E.u分米:r:T(x,\4p+q