【单选题】
在AutoCAD中绘制土木工程图经常需要使用多线。由于一次绘出的多线被当作一叶实体对待，因此对多线的编辑应该使用命令()
①
break
②
mledh
③
explode
④
trim
【单选题】
都属于闻一多创作的诗是____。
①
《死水》、《发现》、《太阳吟》、《残诗》
②
《死水》、《发现》、《忘掉她》、《心跳》
③
《死水》、《发现》、《忘掉她》、《黄鹂》
④
《死水》、《发现》、《心跳》、《印象》
【单选题】
由于幼儿的肌肉中水分多，蛋白质及糖原少，不适合他们的运动项目是( )。
①
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②
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③
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④
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