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“+”“-”在物理中的不同场合有着不同的含义,正确地理解“+”“-”号的含义,是学好物理的基础.下面就列述“+”“-”号在物理中的种种应用.
“+ ” “- ” has different meanings in different occasions in physics, and correctly understanding the meaning of “ ” “- ” sign is the basis for learning physics. + “” - "in a variety of applications in physics.