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一、一元选择题（每小题３分，共４５分）１．方程３ｘ２－４＝０的一次项系数是（ ）（Ａ）－４ （Ｂ）０ （Ｃ）１ （Ｄ）３图Ａ－８２．如图Ａ－８，在Ｒｔ△ＡＢＣ，∠Ｃ＝９０°，那么ｃｔｇＢ＝（ ）（Ａ）ＡＣＢＣ （Ｂ）ＢＣＡＢ（Ｃ）ＡＣＡＢ （Ｄ）ＢＣＡＣ?
First, a multiple choice questions (each small question 3 points, a total of 45 points) 1. The first-order coefficient of equation 3x2-4 = 0 is () (A) -4 (B) 0 (C) 1 (D) 3 Figure A-82. As shown in Figure A-8, at Rt △ ABC, ∠C = 90 °, then ctgB = () ACBC (B) BCAB (C) ACAB