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Энэхүү гар насосоор ажилладаг өргөх ачааны машин нь сэрээ өргөх ажиллагааг хянах гараар бариулыг шахдаг. энэ нь гараар өргөх, гараар хөдөлгөөн хийх зориулалттай сэрээт зөөгч юм. Хоёр жолооны хүрд нь үүнийг хялбархан, уян хатан, тохь тухтай болгох боломжийг олгодог бөгөөд энэ нь маш тохь тухтай, хөдөлмөр хэмнэдэг боловч үр дүнтэй …
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