选择题:6. 作用力与反作用力相等是牛顿第二定律。( ) 题目分类:自然科学基础 题目类型:选择题 查看权限:VIP 题目内容: 6. 作用力与反作用力相等是牛顿第二定律。( )选择一项:对错 参考答案:
She kept on _______ although she was tired. She kept on _______ although she was tired.选择一项:A. workB. working C. to work 分类:自然科学基础 题型:选择题 查看答案