如果货物每吨的平均运程按87公里(合54英里)计算，货物可以被保证在同一天或头天晚上准时交付。
With the average length of hauls being about 87km (54 miles), deliveries can often be guaranteed the same day or overnight.
本文导出了混合理想气体中分子相对速度的分布，并由此计算了混合理想气体中分子的碰撞频率和平均自由程。
At present paper, we deduced the relative velocity distribution of mixed ideal gas molecule. Then we got the average collide frequency and average free distance.
结果表明：随核物质同位旋非对称度的增大，质子平均自由程减小而中子的平均自由程增大。
It is shown that as increasing the isospin asymmetry, the proton mean free path decreases while the neutron one increases.
应用推荐