Imuphi umkhiqizi wama-valve ebhola waseShayina omuhle? Ikhwalithi iyikho konke!
Ngokuthuthuka okuqhubekayo kwensimu yezimboni, ukusetshenziswa kwama-valve ebhola kuyanda, futhi kudlala indima ebalulekile ku-petroleum, amakhemikhali, igesi yemvelo kanye nezinye izimboni. Ngakho-ke, ukukhetha ikhwalithi ye-valve yebhola yaseShayina ...
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