质点与质点系动量定理反映了力在时间上的累积作用,它们具有相同的形式,无需单独证明。
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动量守恒定律是矢量表达式,使用时要注意正方向的选取。
A. 对
B. 错
请用括号里面提供的单词的合适形式填空:The children ____ enjoyed themselves at the Maker Faire in New York.( thorough)
Below is a list of ____ who can turn out custom laser-cut designs and circuit boards.(manufacture)
Roger likes reading; he is an ____member of the local book club.( act)