气体和液体中总的摩尔数之比。
当横流雷诺数与射流雷诺数之比大于0．5之后，有横流时的冲击射流冷却局部努赛尔数比无横流时有较为显著下降。
When the cross-flow to jet Reyuolds number ratios are greater than 0. 5, the jet impingement Nusselt numbers arc obviously lower than that without cross-flow.
实验结果表明：在相同轴线距离处，线元阵列天线轴线能量与单元天线轴线能量之比正比于天线阵列阵元数的平方；
The measured results show that for the same distance along axial line, the maximum energy of antenna array at axial point z is proportional to the square of antenna number of the array;
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