共50条信息
已知\(AB/\!/PQ\),\(BC/\!/QR\),若\(∠ABC=30^{\circ}\),则\(∠PQR\)等于( )
如图,\(E\),\(F\),\(G\),\(H\)分别是空间四边形\(ABCD\)的边\(AB\),\(BC\),\(CD\),\(DA\)上的中点.
若\(OA\)\(/\!/\)\(O\)\(′\)\(A\)\(′\),\(OB\)\(/\!/\)\(O\)\(′\)\(B\)\(′\),且\(∠\)\(AOB\)\(=130^{\circ}\),则\(∠\)\(A\)\(′\)\(O\)\(′\)\(B\)\(′\)为( )
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