A.264°56′30″ B.170°59′51″ C.264°55′33″ D.180°00′03″
A.設(shè)置為奇數(shù) B.設(shè)置為偶數(shù) C.根據(jù)現(xiàn)場情況確定 D.隨意設(shè)置
A.40° B.100° C.220° D.280°