2004年高考湖北卷第11题(以下简称04年试题):已知平面α与β所成的二面角为80°,P为α、β外一定点,过点P的一条直线与α、β所成的角都是30°,则这样的直线有且仅有:(A)1条(B)2条(C)3条(D)4条1源此题很容易让人联想到1993年全国高考理科数学第18题(以下简称93年试题):已知异面 The 2004 Hubei Provincial Entrance Examination Question 11 (hereinafter referred to as the 2004 test question): It is known that the dihedral angle formed by the plane α and β is 80°, P is a certain point outside the α and β, a straight line passing through the point P and α, The angles formed by β are all 30°, so the straight lines are as follows: (A) 1 (B) 2 (C) 3 (D) 4 1 Source This question is easily reminiscent of 1993 The 18th national mathematics of college entrance examination (hereinafter referred to as the 93-year test): Known differences