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2004年高考湖北卷数学第11题(以下简称“＇04题”);已知平面α与平面β所成的二面角为80°,P为α,β外一定点,过P的一条直线与α,β所成角都是30°,则这样的直线有且仅有(A)1条.(B)2条.(C)3条.(D)4条.此题很容易让人联想到1993年全国高考理科数学第18题(以下简称为＇93题):已知异面直a与b所成的角是50°,P为空间
In the 2004 college entrance examination Hubei volume mathematics problem 11 (hereinafter referred to as “’04 item ”); the dihedral angle formed by known plane α and plane β is 80°, P is a certain point outside of α, β, over P The angle formed by a straight line and α, β is 30°, then such a line has (A) 1 and (B) 2 (C) 3 (D) 4. This problem is easy. Reminiscent of the 18th title of the 1993 national mathematics of college entrance examination (hereinafter referred to as the ’93’): It is known that the angle formed by the different straight faces a and b is 50°, and P is the space.