Workers built shelter for survivors, _________ homes had been destroyed.

A． which

B． whose

C． of whom

D． that

在卫星通信中，地球站天线波束轴线不能正确对准卫星天线的波束轴线而带来的损耗被称为( )

A．天线跟踪误差而引入的损耗

B．自由空间传播损耗

C．大气损耗

D．极化损耗