CDMA系统中用到的三种码：PN码、Wash码、长码；其中区分前向信道的是（）码。

A:PN码 B:wash码 C:长码 D:PN码和长码

—Do you have clothes ______ I'll wash them for you.
—No, thank you. I will wash them myself.

A:to be washed B:to wash C:washing D:being washed

—Do you have clothes Ill wash them for you. —No, thank you. I will wash them myself.

A:to be washed B:to wash C:washing D:being washed

—Do you have clothes Ill wash them for you. —No, thank you. I will wash them myself.

A:to be washed B:to wash C:washing D:being washed

—Do you have clothes Ill wash them for you. —No, thank you. I will wash them myself.

A:to be washed B:to wash C:washing D:being washed

—Do you have clothes Ill wash them for you. —No, thank you. I will wash them myself.

A:to be washed B:to wash C:washing D:being washed