【单选题】The same one word may have more than one meaning. This is what we call ______.
【单选题】B The word “day” has two meanings. When we talk about the number of days in a year, we are using “day” to mean 24 hours. But when we talk about day and night, we are using “day” to mean the time betwe...
【简答题】如图,在平面直角坐标系中,直角梯形ABCO的边OC落在x轴的正半轴上,且AB ∥ OC,BC⊥OC,AB=4,BC=6,OC=8.正方形ODEF的两边分别落在坐标轴上,且它的面积等于直角梯形ABCO面积.将正方形ODEF沿x轴的正半轴平行移动,设它与直角梯形ABCO的重叠部分面积为S. (1)分析与计算:求正方形ODEF的边长; (2)操作与求解: ①正方形ODEF平行移动过程中,通过操作、观察,...
【简答题】如图,在平面直角坐标系中,直角梯形 的边 落在 轴的正半轴上,且 ∥ , , =4, =6, =8.正方形 的两边分别落在坐标轴上,且它的面积等于直角梯形 面积。将正方形 沿 轴的正半轴平行移动,设它与直角梯形 的重叠部分面积为 。 小题1:(1)分析与计算: 求正方形 的边长; 小题2:(2)操作与求解: ①正方形 平行移动过程中,通过操作、观察,试判断 ( >0)的变化情况是 ; A.逐渐增大...
【简答题】在平面直角坐标系xoy中,已知△ABC和△DEF的顶点坐标分别为A(1,0)、B(3,0)、C(2,1)、D(4,3)、E(6,5)、F(4,7)。按下列要求画图:以点O为位似中心,将△ABC向y轴左侧按比例尺2:1放大得△ABC的位似图形△A 1 B 1 C 1 ,并解决下列问题: (1)顶点A 1 的坐标为( ),B 1 的坐标为( ),C 1 的坐标为( ) ; (2)请你...
【简答题】求通过点(0,2,4) 且与两平面x+2z=1,y-3z=3 平行的直线方程。
【单选题】The same one word may have more than one meaning. This is what we call ______.
【简答题】The word “conservation” has a thrifty meaning. To conserve is to save and protect, to leave what we ourselves enjoy in such a good condition that others may also share the enjoyment. Our forefathers h...
【判断题】Connotative meaning of a word refers to the primary meaning of the word that we often use to label things.
【简答题】在平面直角坐标系xOy中,已知△ABC和△DEF的顶点坐标分别为A(1,0)、B(3,0)、C(2,1)、D(4,3)、E(6,5)、F(4,7)。按下列要求画图:以点O为位似中心,将△ABC向y轴左侧按比例尺2:1放大得△ABC的位似图形△A 1 B 1 C 1 ,并解决下列问题: (1)顶点A 1 的坐标为 ▲ ,B 1 的坐标为 ▲ ,C 1 的坐标为 ▲ ; (2)请你利用旋转、平移两种变...