【单选题】【消耗次数：1】
骨骼肌收缩的原理是：
①
粗、细肌丝之间相互滑行
②
粗肌丝本身缩短
③
粗肌丝向细肌丝内滑行
④
细肌丝本身缩短
⑤
粗、细肌丝同时缩短
参考答案：
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相关题目
【单选题】
化工制图中图线宽度分粗、中粗、细三种，若粗实线的宽度为d，则细实线的宽度为( )。
①
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2d
②
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d
③
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1/2d
④
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1/4d
随机题目
【判断题】
“数与代数”的内容主要包括数与式、方程与不等式、函数，它们都是研究数量关系和变化规律的数学模型，可以帮助人们从数量关系的角度更准确、清晰地认识、描述和把握现实世界。
①
正确
②
错误