A.安全風(fēng)險(xiǎn)B.環(huán)境風(fēng)險(xiǎn)C.工期風(fēng)險(xiǎn)D.投資風(fēng)險(xiǎn)
A.短波2mm/20mB.長(zhǎng)波高低和軌向5mm/300mC.短波3mm/20mD.長(zhǎng)波高低和軌向10mm/300m
A.一次布網(wǎng)B.二次布網(wǎng)C.分時(shí)觀測(cè)D.同時(shí)觀測(cè)