Ko‘r perchinlar tortilmaganda nima bo‘ldi?

Perchinning quyidagi ikki turi bo'lishi mumkin:

1. Diafragma juda katta va perchinning diametri juda kichik va perchinning kengayishi etarli emas.

2. Tortish tirgakning uzunligi perchinlash uchun juda qisqa.

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