The shipping papers for the products being carried in your tanker are NOT required to contain the().
A. exact quantity of the cargoes
B. grades of the cargoes
C. location of the delivery point(s)
D. name of the consignee(s)
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自由空间传输损耗的计算公式是(),式中频率的单位是MHz,距离的单位是km。
一般工件材料的硬度越高,()。
A. 塑性越大
B. 强度越高
C. 韧性越好
D. 越耐磨