A.拍底 B.尾淹 C.上浪 D.空轉(zhuǎn)
A.L>λ;d/L<10% B.L>λ;d/L<5% C.L≈λ;d/L<10% D.L≈λ;d/L<5%
A.1/3 B.1/4 C.1/2 D.2/3