试述光纤材料色散的定义及其引起的原因。
（）means a document which evidences a contract of carriage by sea and the taking over or loading of the goods by the carrier，and by which the carrier under takes to deliver the goods against surround of the document. Bill of lading。 Bill of exchange。 Mate's receipt。 Manifest。
The static suction lift of a pump is the difference in elevation between the （）. centerline of the pump and the level of the liquid in the suction well when the source of liquid is below the pump。 centerline of the pump and the suction liquid level when the source of liquid is above the pump。 centerline of the pump and the level of the discharge liquid。 liquid levels of the suction and discharge。
承包方必须按照发包方的要求提供相关材料，接受发包方的（）查。 条约。 资历。 资质。 条件。
浪漫主义文学流派的代表人物是（） 鲁迅。 郭沫若。 陈独秀。 钱玄同。
一切法律、行政法规和地方性法规都不得同（）相抵触。
