[填空题] 《楚辞补注》是宋人（）的楚辞注本。

计量泵的适宜转速是多少？为何不能过高或过低？ 看火操作的三种基本控制是什么？ You are underway and pass by a lighthouse.Its light，which was white since you first sighted it，changes to red．This means（）. ["The light is characterized as alternately flashing","The lighthouse has lost power and has switched to emergency lighting","It is the identifying light characteristic of the lighthouse","You have entered an area of shoal water or other hazard"] 用户开通ADSL业务后，上网无异常，但电话杂音大，最有可能的故障原因为（） ["用户线质量差","没接滤波器或滤波器坏","用户MODEM发热异常","电台干扰"] 封闭现象对计量的影响是什么？ 《楚辞补注》是宋人（）的楚辞注本。