笋干丝(塑料袋装;净重250g)
参考答案:20(0712.9010)
一辆坦克的质量为3×104千克,每条履带的着地面积5米2,求它对水平地面的压力和压强各为多大?
______you told me______true
A.Is what; /
B.What; /
C.That ; is
D.What about ; is