【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
【单选题】
“大河有水小河满，大河无水小河干”。对此理解不正确的是（）。
①
集体主义要求我们坚持以集体利益为重
②
个人利益于集体利益不会发生矛盾
③
个人利益与集体利益在根本上是一致的
④
坚持集体主义的同时，个人的正当利益也应当得到维护
【单选题】
“诚于中而形于外”说明（）。
①
礼仪是道德的内在涵养，道德是礼仪的外在表现
②
礼仪容易做到，诚信不容易做到
③
礼仪与道德没有什么区别,完全-样
④
礼仪是道德的外在表现，道德是礼仪的内在涵养