On the basis of standing long jump and sitting forward by 20 points last year, the score of 50-meter running 10 was increased. In this way, the total score of the physical education examination in the senior high school entrance examination this year has increased to 30 points; At the same time, in order to guide correctly, pay attention to cultivating students' practical ability, and promote the construction and application of school laboratories, the score of physical and chemical experiment operation examination has increased from 5 last year to 10 this year. As for the physical and chemical experiment examination, physics: ① explore the current relationship of each point in the series circuit;
(2) Explore the relationship between the voltages of each point in the series circuit.
Chemistry: ① filtration of crude brine;
② Explore the fluidity of metals (magnesium, zinc, copper).
Candidates choose an examination question by drawing lots before the exam.