A.5處/10km,每處2點(diǎn)B.3處/10km,每處2點(diǎn)C.5處/5km,每處2點(diǎn)D.3處/5km,每處2點(diǎn)
A.15B.18C.32D.36
A.雙對(duì)數(shù)坐標(biāo)曲線B.單對(duì)數(shù)坐標(biāo)曲線C.直角坐標(biāo)曲線D.以上說(shuō)法都不正確