All measures involve numbers and units. Scientific quantities are expressed in numbers and units, both are required to express any quantity. Thus, the ability to use SI units is essential.
This is a trial quiz, and your mark for this quiz will NOT be included for average. You can practice this quiz via the internet without fear. You have only one chance to practice, however. Once start a quiz, please DO NOT use the Backpage and Reload buttons. Please DO NOT goto other Internet site either. If you do any of these, the computer will record a ZERO as your mark, and you have no chance of re-writing the quiz.
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