A.Ⅰ、Ⅱ、Ⅳ B.Ⅰ、Ⅲ、Ⅵ C.Ⅱ、Ⅲ、Ⅴ D.Ⅱ、Ⅳ、Ⅵ
A.后方交會 B.側(cè)方交會 C.方向交會 D.前方交會
已知邊長,方位角,則和分別為:()
A.+31.401m,+66.420m B.+31.401m,-66.420m C.-31.401m,+66.420m D.-66.420m,+31.401m