DOCUMENTS REQUIRED: +SIGNED COMMERCIAL INVOICE IN QUADRUPLICATE IN THE NAME OF LERROS MODEN (HOLIAND) GMBH,IM TAUBENTAL 35,D-41468 ROTTERDAM THE NETHERLANDS ,SHOWING SEPARATELY THE L/C NO.,P/O NO.,STYLE NO.,FREIGHT CHARGE,INSURANCE PREMIUM AND COUNTRY OF ORIGIN. 请问:(1)该商业发票是否需要签字? (2)该商业发票一共需要多少份?是否需要正本? (3)该商业发票的抬头人如何填写? (4)该发票需要注明哪些项目?