什麼是 PRE-SHIPMENT INSPECTION?

最近收到孟加拉LC, 條款
C) FULL SET OF CLEAN SHIPPED ON BOARD OCEAN BILL OF LADING A REGULAR LINER VESSEL MARKED "FREIGHT PREPAID" DRAWN ON OR ENDORSED TO THE ORDER OF ISLAMI BANK BANGLADESH LTD. NOTIFY OPENER AND US.
G) PRE-SHIPMENT INSPECTION OF 100PCT CONSIGNMENT WITH REGARD TO QUALITY,QUANTITY,SPECIFICATION WEIGHT ETC. AS DESCRIBED IN THE CREDIT AND THE RELATED B/L OF MUST BE CONDUCTED BY THE BENEFICIARY AT BENEFICIARY'S COST AND A CERTIFICATE TO THIS EFFECT ISSUED BY BENEFICIARY MUST ACCOMPANY ORIGINAL DOCUMENTS.”上網發現意思, 裝船前我方必須檢驗證明商品，符合信用證所提及的貨物質量，數量，規格重量等；正本裝船前檢驗證明，隨全套單據提交到銀行。 請指教
1.在C點, B/L應如何繕寫?
2.DRWAN ON OR ENDORSED是什麼意思?
3.在G點, 是否需僱用公證行, 條款中好似受益人出什麼證明?
4.為何關於B/L, 有什麼需要處理?