Thanh toán linh ho?t: Thanh toán ti?n m?t tr?c ti?p khi nh?n tem ho?c thanh toán tr??c qua tài kho?n.Shroud-The delicate iron casing surrounding the electromagnetic lenses on the TEM. Solenoid-An electromagnetic lens fashioned by copper windings by using a immediate present working via it.The 2nd anode (Anode two) accelerates the electrons to t