【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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mso-para-margin-bottom:.0001pt;
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mso-bidi-font-size:11.0pt;
font-family:等线;
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mso-ascii-theme-font:minor-latin;
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d
③
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7.8 磅
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mso-padding-alt:0cm 5.4pt 0cm 5.4pt;
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1/2d
④
Normal
0
7.8 磅
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1/4d
随机题目
【单选题】
关于不定时工时制的说法中，错误的是（）
①
不定时工时制的总工时标准和标准工时制是一样的。
②
不定时工时制的工资基准并非最低工资标准。
③
单位采用不定时工时制需要劳动行政部门部门核准。
④
不定时工时制无加点的说法。