Which is ______ the sun, the moon or the earth? [ ]

A．as big as

B．big

C．bigger

D．the biggest

电缆按用途分，下列正确的是（）。

A.电力电缆、控制电缆

B.架空电缆、水底电缆

C.通信电缆、射频电缆

D.铠装电缆、无铠装电缆