Ọkọ ẹru ina Yunlong jẹ apẹrẹ pataki fun gbogbo awọn ohun elo nibiti igbẹkẹle, didara iṣelọpọ ati apẹrẹ iṣẹ jẹ pataki.J4-C jẹ apẹrẹ tuntun fun ojutu maili to kẹhin.Ọkọ ohun elo itanna yii jẹ abajade ti awọn ọdun ti iriri ati awọn idanwo lori aaye yii.
Ipo: Fun ojutu maili to kẹhin, ojuutu pipe fun awọn eekaderi ati pinpin ẹru ọkọ oju-irin ati irinna
Awọn ofin sisan: T/T tabi L/C
Iṣakojọpọ & Gbigbe: Awọn ẹya 8 fun 40HC.