题目

The (clock) on the desk are Linda's and Jane's. 答案：【1】clocks若P在曲线：y=x3-3x2+2x+5上移动，经过P点的切线的倾斜角为α，则α的取值范围是[0，π2）∪[3π4，π）[0，π2）∪[3π4，π）．