【简答题】已知两点A(2,0),B(0,4),且∠1=∠2,则tanβ=______.
【单选题】Some scientists believe that brain is pre-programmed for language. The word 'pre programmed' means_______.
B.
programmed before one is born
【简答题】x 的初值是 10 ,用 for 语句完成 x 自加 20 次,写出语句。
【单选题】听力原文:M: There is going to be a bus strike tomorrow. W: It will be all right if it is a fine day, but if it is wet there will be long queues on the underground. What does the woman worry about most?
【简答题】已知抛物线y=-x 2 +(m-4)x+2m+4与x轴交于点A(x 1 ,0),B(2 ,0)两点,与y轴交于点C, 若点A关于y轴对称点是点D。 (1)求C、D两点坐标。 (2)求过点B、C、D三点的抛物线的解析式。 (3)若P是(2)中所求抛物线的顶点,H是这条抛物线上异于点C的另一点,且S △ABH =24S △BDP ,求直线PH的解析式。
【单选题】Some scientists believe that the brain is pre-programmed for language. Here 'pre-programmed' means ______.
B.
programmed before one is born
【简答题】如图,已知两点A(2,0) , B(0,4) , 且∠1=∠2,则点C的坐标是__________?
【单选题】宗教改革的领袖们以及最初开出了宗教改革的潮流带有()色彩。
【判断题】惯性冲击静电除尘器是利用惯性力和电场力作用,将极板与气流方向垂直设置,提高气速可提高除尘效率。