题目内容
质点系是指一群有一定相互关系的质点组成的系统。（）
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Decide whether the sentence that uses the underlined word are correct (✓) or false (×).1 ___ A A machine is a branch of instruction or learning.
___ B To design something is to plan how it will look and function.
2 ___ A To inspect something is to examine it carefully.
___ B Mathematics is a science that studies matter.
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