Section 1 Generation and Propagation of Sound

How do we hear voices in the second quarter?

The characteristics of the voice in the third quarter

The fourth quarter noise hazards and control

Section 5 the use of sound

Chapter II Light Phenomenon

Section 1 The Propagation of Light

The reflection of light in the second quarter

Section 3 Plane Mirror Imaging

The refraction of light in the fourth quarter

Section 5 Scattering of Light

Section 6 Invisible light

Chapter III Lenses and Their Applications

First lens

The lens in the second quarter of life

The third section discusses the law of convex lens imaging.

Section 4 Eyes and Glasses

Section 5 Microscopes and Telescopes

Chapter IV Changes in the Situation

Section 1 Thermometer

Section 2 Melting and Solidification

Section 3 vaporization and sublimation

Section 4 sublimation and sublimation

Chapter V Thermal Energy and Energy

Chapter VI Energy and Sustainable Development

Chapter VII Preliminary understanding of the material world

Chapter VIII Strength and Movement

Chapter 9 Pressure

Chapter X Buoyancy

Chapter XI Machinery and Mechanical Energy

Chapter 12 Current and Circuit

Section 1 Fees

Section 2 Current and Circuit

Section 3 Series and Parallel Connection

The intensity of the current in the fourth quarter

The fifth part discusses the current law of series and parallel circuits.

Section 6 Household Circuit

Chapter VI Ohm's Law

Section 1 voltage

The second section discusses the voltage law in series and parallel circuits.

Section 3 resistance

Section 4 ohm's law

Section 5 Measuring the Resistance of Small Bulbs

Section 6 ohm's law and safe use of electricity

mathematics

Chapter 1 Rational Numbers

1. Understanding of rational numbers

1. 1 has the opposite meaning.

1.2 axis, reciprocal and absolute value

1.2. 1 axis

1.2.2 reciprocal

1.2.3 absolute value

2. Rational number operation

1.4 addition of rational numbers

Rational number subtraction of 1.5

Rational Multiplication of 1.6

Division of rational number 1.7

1.8 power of rational number

The mixed operation of 1.9 rational numbers

1. 10 is calculated by the counter.

Chapter II Algebraic Formulas

2. 1 Use letters to represent numbers.

2.2 column algebra

2.3 the value of algebra

2. Addition and subtraction of a class of algebraic expressions

Chapter III Graphic Appreciation and Operation

3. 1 graphic appreciation

3.2 Plane graphics and spatial graphics

3.3 Observation object

3.4 graphic operation

3.5 view

The fourth chapter is the model and algorithm of one-dimensional linear equation.

4. 1 one-dimensional linear equation model

4.2 Algorithm for Solving Unary Linear Equation

4.3 Application of one-dimensional linear equation

Chapter V One-dimensional Linear Inequalities

5. Basic properties of1inequality

5.2 the solution of one-dimensional linear inequality

5.3 Application of one-dimensional linear inequality

Chapter VI Receiving and Description of Data

6. 1 data reception

6.2 Statistical chart

6.3 Average, Median and Mode