Trees should only be pruned when there is a good and clear reason for doing s...

What is the teacher doing in terms of error correction?T: Does any of you h...

Which of the following practices can encourage students to read an article cr...

Passage 2Scientists have been surprised at how deeply culture--the language...

Being__________ of money, she managed to save enough for a holiday.　　A. econom

Over the past ten years, China has__________a series of great changes in its ...

When asking students to quickly run their eyes over a whole text to get the g...

Which of the following shows the correct sentence stress in normal cases

Portfolios, daily reports and speech delivering are typical means of _________.A

Which of the following may better check students′ ability of using a grammati...

根据题目要求完成下列任务，用中文作答。用四种方法引入Christmas的课文，并举例。

Teachers believing in the _______model in a general sense usually follow the ...

(1)求子空间V3的维数；(2)求子空间V3的一组标准正交基。

A.0B.1C.2D.3A.0 B.1 C.2 D.3

一条光线斜射在一水平放置的平面镜上,入射角为2π/6,请建立空间直角坐标系,并求出反射光线的方程。若将反射光线绕平面镜的法线旋转一周,求所得的旋转曲面的方程。

四个图形:相交直线、等腰三角形、平行四边形、正多边形,既是轴对称又是中心对称的有(  )个。A.1 B.2 C.3 D.4

叙述“严谨性与量力性相结合”数学教学原则的内涵。并以“√2是无理数”的教学过程为例，说明在教学中如何体现该教学原则。

创立解析几何的主要数学家是( )。A、笛卡儿、费马 B、笛卡儿。拉格朗日 C、莱布尼茨，牛顿 D、柯西，牛顿

设a、b为实数，0

下列关于数学思想的说法中，错误的一项是( )A.数学思想是现实世界的空间形式和数量关系反映到人的意识之中并经过思维活动产生的结果  B.数学思想是要在现实世界中