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subject (chemistry (Measures to prevent and control water pollution: ((2)…

- - - - Handball is played on a field 40 meters long and 20 meters wide. In the middle of the court, there is a center line parallel to the goal line and connecting the two lines to divide the court into two equal halves. A 3-meter-wide and 2-meter-high goal is set in the middle of both ends of the field. Draw an arc-shaped goal area line 6 meters away from the goal in front of the goal, and the line is the goal area. Each team has seven players, including one goalkeeper
    - - (1) passing and receiving skills: passing and receiving is a purposeful transfer between players in handball games. In the game, one handed pass is often used. According to the different positions, moving ways and action structures, it can be divided into in-situ, moving, jumping one handed shoulder pass, one handed side pass, throw pass, low handed pass, back pass, neck pass, etc. And catching the ball is mostly two hands catching the ball of different heights. For example, take the high ball, the flat ball and the low ball.
      - ② shooting technique: shooting is the only way to score. There are many shooting methods: supporting shooting, that is, shooting with one foot or two feet on the ground, such as shooting in situ, blocking step, cross step, running, etc.; jumping shooting, which is to strive for space advantage and shorten the distance to get rid of the blocking of the defensive players, up or forward jumping shooting technology; falling shooting, which is to get rid of the defense and expand the shooting angle and receiving Close to the goal, use the body extremely forward, in the state of losing the balance of the body's center of gravity, fall to finish shooting
      - (3) breakthrough technology: it is a method for the ball players to use reasonable mobile technology to surpass the defenders, which is very aggressive. It can not only shoot directly, but also disrupt the normal defense and create attack opportunities for the peers. According to the different direction and movement structure of the breakthrough, it can be divided into the same side breakthrough, different side breakthrough, jump step breakthrough and turn breakthrough.
  - - - Direct racket: on the front of the racket, the first joint of the thumb and the second joint of the index finger are fastened on both sides of the racket handle, which is in the shape of forceps with moderate distance, and the racket handle is pressed on the tiger's mouth.
      - Horizontal racket: hold the handle of the racket with the palm of your hand, and stick it to the root of the racket with the tiger mouth.
- - - - "Leave + place" means "leave a place". For example: when did you leave?
      - "Leave for + place" means "leave for somewhere". For example: next Friday, is leaving for
      - "Leave + place + for + place" means "leave a place to a place". For example: Why are you leaving for?
    - - It is used to give advice and persuade others. For example:
        You should go to the doctor if you feel ill.
      - Used to express the concept of "should" or "should not". At this time, it often refers to the elder teaching or blaming the younger. For example:
        You should be here with clean hands.
      - Used to indicate possibility. The usage of "should" is a common test point in examinations. For example:
        We should arrive by supper time.