第29题: [填空题]Newton’s second law of motion says force equals ______, multiplied by the change in speed it produces in an object. 参考答案:the mass of an object 答案解析:[精解] 本题答案可根据倒数第二段的倒数第二句获得。“Newton’s second law of motion describes force. It says force equals the m
第30题: [单项选择]腰椎管狭窄症,药物治疗宜() A. 温通经络、强壮筋骨 B. 化瘀生新、活络止痛 C. 活血舒筋 D. 舒筋活络止痛 E. 活血化瘀、行气止痛 参考答案:A