Refer to the passage below and then answer the question afterwards in the same language as the passage: Passage: This designation was given to upgraded vehicles of the first batch of Leopard 2s, brought up to the standard of the second and third batches. This modernization gradually replaced the original PZB 200 sights in the first batch with thermal sights for the EMES 15 as they became available. Uyezve, kuti ndiwedzere zvaisanganisira kugadziriswa filler mawindo uye muvharo kuti mberi muviri mafuta Matangi kubvumira vakaparadzana refueling, uyewo kuwedzera mumwe deflector ndiro kuti periscope uye guru coverplate kudzivirira huripo NBC kudzivirira hurongwa. Pakupedzisira, tangi akapiwa itsva shanu-mita towing netambo ane nzvimbo yakasiyana. Chirongwa yakatanga muna 1984 uye rakapera muna 1987; wechitatu, wechina uye wechishanu batch, izvo dzakabudiswa munguva iyi, akanga refueled chete zvinhu. The batch yokutanga ano inogona kuzivikanwa nokufukidza rakasiyana denderedzwa buri apo mudziyo-mhepo ndiro yakabviswa nokuda cross-mhepo kutonga hurongwa. Mubvunzo: Z
Leopard 2s