insomnia
发表于 2025-3-26 22:30:04
Using electricity,icles. These charged particles are negative electrons. We cannot see them moving but we are aware of their effect. For example, a wire carrying a current becomes warm and a bulb in the circuit lights up. The unit of electric current is the ampere, usually shortened to ‘amp’.
Mnemonics
发表于 2025-3-27 03:27:54
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Irascible
发表于 2025-3-27 07:33:16
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有害处
发表于 2025-3-27 13:19:15
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shrill
发表于 2025-3-27 13:59:36
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吹牛需要艺术
发表于 2025-3-27 18:23:29
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取之不竭
发表于 2025-3-27 22:19:54
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coalition
发表于 2025-3-28 05:53:45
Transporting substances to cells,portant process is called respiration. (As the process uses oxygen it is more correctly called aerobic respiration.) Your cells are respiring as you sit and read this. The process can be summarised in an equation:
口音在加重
发表于 2025-3-28 07:44:33
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filicide
发表于 2025-3-28 14:29:25
Using forces,rstand. If you let go of a bag it falls to the floor. The pull of the Earth on an object is called the .. Two magnets attract one another if opposite poles are brought together. . are acting here. . can cause attraction between a plastic comb and your hair.