A.獨(dú)立監(jiān)測網(wǎng) B.國家控制網(wǎng) C.圖根控制網(wǎng) D.城市控制網(wǎng)
A.2.001m B.0.923m C.0.539m D.1.743m
A.CCVV B.CCLL C.HHLL D.HHVV