To 语者, 

If you are fond of organic chemistry, this diagram is a must-see in 2018 in terms of nomenclature of simple materials and utilisation of...

The thick horizontal line in the above diagram is called the x-axis, and the thick vertical line is called the y- axis. The point at...

Most geometry problems on the test require straightforward calculations. However, some problems measure your insight into the basic rules...

05/08/17 Score improvements consistent across gender, family income, race, and ethnicity NEW YORK and MOUNTAIN VIEW, CA — New data show...

#SATExam

There are many cases besides that of carbon dioxide where the bond polarities op- pose and exactly cancel each other. Some common types...

(a) The charge distribution in the water molecule. (b) The water molecule in an electric field. (c) The electrostatic potential diagram...

We should distinguish the difference between a central angle and an inscribed angle. #GREMaths #GMATMaths

在英语的几何中，无疑圆的术语会更为陌生些，例如circumference， 你需要区别它于四边形中的perimeter；radius，diameter，chord，secant，arc。以下给出类这些词汇的英文定义。 #GMATMaths #GREMaths

当面对数不清的数学运算公式时，最有效的记忆方式是理解公式中每一个缩写字母的含义例如A = area; S = side; P = perimeter; b = base; h = height，这些简单的缩写不会随着时间的推移而遗忘掉。 #GMATMaths #GREMaths

#GMATMaths #GREMaths

(a) When a charged rod is brought near the metal sphere without touching it, some of the positive and negative charges in the sphere are...

Like charges repel and unlike charges attract each other. A new technology based on the electric force may revolutionise the way books...

Trends in ionisation energies (kJ/mol) for the representative elements. Atomic radii (in picometers) for selected atoms. Note that atomic...

原子核外电子排布通常是中国学生化学学习初期的盲区。 #Chemistry

A triangle with two equal sides is called isosceles. The angles opposite the equal sides are called the base angles, and they are...

When parallel lines are cut by a transversal, three important angle relationships exist: Alternate interior angles Corresponding angles...

#GMATMaths #GREMaths

The total mechanical energy (E = KE + PE) of an object remains constant as the object moves, provided that the net work done by external...