Now give the key test sites:
physics
The most important thing: electrical experiment
Test center 1: Draw the circuit diagram, especially the equivalent circuit diagram.
Test site 2: experimental steps. Pay attention to the zero setting of the electric meter, the switch off, the maximum access resistance of the sliding rheostat, record the data, and the frequency distribution of the experiment 1, 1, 4. The idiom "Arrange the equipment, analyze the data and draw a conclusion".
Test center 3: design the experimental data record table. Note the header, border and no serial number!
Test center no.4: calculation questions. Pay attention to parallel I=I 1+I2, U=U 1=U2, series I=I 1=I2, U=U 1+U2.
Second: convex lens imaging
This test center has the most questions, so we should pay attention to the focal length, object distance, image distance relationship, imaging properties and so on. In addition, distinguishing concave-convex lenses, myopia/hyperopia and correction are tested almost every year.
Again: the change of state.
This part is more common in multiple-choice questions. But "the melting law of ice" and "the boiling law of water" are common experimental problems.
Finally: sound phenomenon
Test sites include three elements of music (timbre and loudness of tone are not rhythm and melody) and sound propagation (mainly including noise prevention, vacuum silence and sound speed).
Mathematics is mainly based on linear function, axial symmetry and factorization.
You can give a classic example.
As shown in the figure, B is a point on PE, C is a point on the plane, and the PE bisecting angle CPD? Verify PA+PC
Proof: intercept PC on PE' = PC link BC'
Easy to prove (if you want to avoid this word in the exam) BC'=BC
BA+BC ' & gt； AC '
∴pa+pc<； Ba+BC
I hope it helps you! Happy new year! The exam was successful!