Explain the meaning of SI base units and SI derived units

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• 英语翻译This unit of mass has not been given a special name.The International System of Units(SI) is an absolute system.The base units are the meter,the kilogram(for mass),and the second.The unit of force is derived using Newton's second law and is called the newton to distinguish it from the kilogram,which,as indicated,is the unit of mass.The units constituting the newton(N) are .(公式）…The weight of an object is the force exerted upon it by gravity.Design
• Explain the meaning of SI base units and SI derive
• Explain the meaning of SI base units and SI derived units用英文回答
• Explain the meaning of SI base units and SI derive
• 英语翻译a second class of SI units comprises the derived units,many of which have special names.Table1-4 is a list of those we shall find most useful in our work in this book.The radia(symbol rad)is a supplemental unit in SI for a plane angle.Aseries of names and symbol to form multiples and submultiples of SI units has been established to provide an alternative to the writing of powers of 10.Table A-1 includes these prefixes and symbols.
• Explain the meaning of SI base units and SI derived units
• 什么是建筑中的阴角和阳角
• 若tanx=－三分之根号三,且－π