雷达正常开机调整之后，荧光屏上所显示的物标回波亮度的强弱将取决于（）。

A.物标的反射性能

B.物标的大小

C.物标的远近

D.A＋C

A change of a documented vessel’s name can only be made by the（）.

A.American Bureau of Shipping

B.Commissioner of Customs

C.Treasury Department

D.Coast Guard