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题已知异面直线a与b所成的角为50°,P为空间一点,则过点P且与a、b所成的角都是30°的直线有且仅有( ) (A)1条. (B)2条. (C)3条. (D)4条.
It is known that the angles formed by the different straight lines a and b are 50°, P is a space point, and the straight line passing through the point P and forming a 30° angle with a and b is only () (A) 1 article. (B) 2 articles. (C) 3 articles. (D) 4 articles.