10.承上題,水平夾角∠CAB,其值下列何者正確?
(A)30°
(B)45°
(C)60°
(D)90°
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統計: A(26), B(4), C(26), D(1), E(0) #660753
統計: A(26), B(4), C(26), D(1), E(0) #660753