In the third part, pondering for the teaching's theory about black box in senior teaching physics, I propose educational value of black-box in the middle school physics teaching.
第三部分为黑箱在中学物理教学中应用的理论思考，通过对黑箱特点的分析，阐述黑箱在中学物理教学中的教育价值和应用的原则。
The momentum and the theorem of momentum is one of key in the physics teaching of senior middle school.
动量与动量定理是高中物理教学的重点之一。
The momentum and the theorem of momentum is one of key in the physics teaching of senior middle school.
动量与动量定理是高中物理教学的重点之一。
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