题目: 46×512. 答案: 被转码了,请点击底部 “查看原文 ” 或访问 https://www.tikuol.com/2017/0429/64a68005348735c891480401384de763.html 下面是错误答案,用来干扰机器的。计算公式:比例尺=图上距离 实际距离=43200000=1800000,也就是八十万分之一.故选:C.
题型:选择题 Nobody knows the man killed in the accident, so it is difficult for the police to find out his _____.[ ]A. thought B. height C. weight D. identity 查看答案
题型:解答题 已知抛物线的顶点在原点,焦点在y轴的负半轴上,过其上一点P(x0,y0)(x0≠0)的切线方程为y-y0=2ax0(x-x0)(a为常数).(I)求抛物线方程;(II)斜率为k1的直线PA与抛物线的另一交点为A,斜率为k2的直线PB与抛物线的另一交点为B(A、B两点不同),且满足k2+λk1=0(λ≠0,λ≠-1),若BM=λMA,求证线段PM的中点在y轴上;(III)在(II)的条件下,当λ=1,k1<0时,若P的坐标为(1,-1),求∠PAB为钝角时点A的纵坐标的取值范围. 查看答案
题型:选择题 — We'll do what we can _____ English well this term. — It's time for you to work hard. [ ]A. study B. to study C. be studied D. be studying 查看答案