判斷題
單項(xiàng)選擇題
A.71B.21C.11D.61
A.1.34×109/cm3B.6.7×108/cm3C.2.2×109/cm3D.1.1×109/cm3
A.1.24×10-10cm2/s·VB.6.19×10-11cm2/s·VC.9.14×10-10cm2/s·VD.4.57×10-10cm2/s·V