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第 卷一、选择题 (每小题 5分 ,共 4 0分 .)(1) i- 2的共轭复数是 ( ) .(A) 2 + i (B) 2 - i(C) - 2 + i (D) - 2 - i(2 )函数 f (x) =| log2 x|的图像是 ( ) .(3)有如下三个命题 :1分别在两个平面内的两条直线一定是异面直线 ;2垂直于同一个平面的两条直线是
Volume I. Multiple-choice questions (5 points for each question, for a total of 40 points.) (1) The conjugate complex number of i- 2 is (). (A) 2 + i (B) 2 - i (C) - 2 + i (D) - 2 - i(2) The function f(x) =| log2 x| is an image of (). (3) There are three propositions: 1 The two lines in two planes must be Homogeneous straight lines; two straight lines perpendicular to the same plane are