Ngoni, an engineering graduate, has invented a highly secret and efficient process for borehole and water drilling. The device was superior but less expensive than similar devices on the market. He secured contracts with several large companies to market his device and went to great expense to retool his operations for production at the same time. Ngoni ordered from a manufacturer, Mhizha Enterprises, a consignment of plastic component parts which were needed in the manufacturing of said equipment for borehole and water drilling. Mhizha Enterprises received instructions to produce the parts by a specific date. The manufacturer failed to deliver the parts on time as he had discovered that he did not have the capacity to do so in the agreed time. Ngoni had no other alternative sources of supply and therefore lost several lucrative contracts he had arranged. The contracts are worth US$50,000.Required:In relation to the law of contract, advise whether Ngoni can sue Mhizha Enterprises for breach of contract, and whether the claim can include the loss of sales as damages. (10 marks)

机械设备传动部位应按规定设置保护罩或保护（）。

A、断电保护装置

B、警戒

C、栏杆

D、销