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Economist & Yao D.B.
- 2018年1月1日
A maven of Chemistry
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...

Yuzhe
- 2017年6月22日
Coordinate Geometry
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...

Yuzhe
- 2017年6月22日
Maths skill in GMAT/GRE
Most geometry problems on the test require straightforward calculations. However, some problems measure your insight into the basic rules...
Collegeboard + Yuzhe
- 2017年6月20日
New Data Links 20 Hours of Personalized Official SAT Practice on Khan Academy to 115-Point Average S
05/08/17 Score improvements consistent across gender, family income, race, and ethnicity NEW YORK and MOUNTAIN VIEW, CA — New data show...

Collegeboard + Yuzhe
- 2017年6月20日
SAT Exam introduction
#SATExam

Yuzhe
- 2017年6月20日
Types of molecules with polar bonds but no resulting dipole moment
There are many cases besides that of carbon dioxide where the bond polarities op- pose and exactly cancel each other. Some common types...

Yuzhe
- 2017年6月20日
Bond polarity and dipole moments
(a) The charge distribution in the water molecule. (b) The water molecule in an electric field. (c) The electrostatic potential diagram...

Yuzhe
- 2017年6月15日
Characteristics of circle
We should distinguish the difference between a central angle and an inscribed angle. #GREMaths #GMATMaths

Yuzhe
- 2017年6月13日
Circle terms
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

Yuzhe
- 2017年6月13日
Different types of quadrilateral - basic calculation
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

Yuzhe
- 2017年6月11日
Basis of quadrilaterals
#GMATMaths #GREMaths

Yuzhe
- 2017年6月11日
Charging by Contact and by Induction - physics/物理
(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...

Yuzhe
- 2017年6月11日
Law of Conservation of Electric Charge - physics/物理
Like charges repel and unlike charges attract each other. A new technology based on the electric force may revolutionise the way books...

Yuzhe
- 2017年6月11日
Periodic trends - chemistry - 离子化能量和原子半径
Trends in ionisation energies (kJ/mol) for the representative elements. Atomic radii (in picometers) for selected atoms. Note that atomic...

Yuzhe
- 2017年6月11日
The Aufbau principle and electron configurations
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

Yuzhe
- 2017年6月7日
Types of triangles - Maths/数学
A triangle with two equal sides is called isosceles. The angles opposite the equal sides are called the base angles, and they are...

Yuzhe
- 2017年6月7日
Angles in parallel lines - Maths/数学
When parallel lines are cut by a transversal, three important angle relationships exist: Alternate interior angles Corresponding angles...

Yuzhe
- 2017年6月7日
Geometry - lines and angles - Maths/数学
#GMATMaths #GREMaths

Yuzhe
- 2017年6月7日
The Principle of Conservation of Mechanical Energy Mechanical Energy - physics/物理
The total mechanical energy (E = KE + PE) of an object remains constant as the object moves, provided that the net work done by external...