A.網(wǎng)點(diǎn)密度 B.網(wǎng)點(diǎn)面積 C.網(wǎng)點(diǎn)形狀 D.網(wǎng)點(diǎn)角度
A.1923 B.1932 C.1935 D.1953
A.1969 B.1979 C.1989 D.1999