锌合金

　　Battleground Afghanistan looks inside the latest chapter of the Afghan conflict as seen by American Marines on the front-lines of the war. As tens of thousands of troops withdraw from Afghanistan, Capt. Ben Middendorf and his men of Golf Company, 2nd Battalion, 5th Marines — based at Camp Pendleton in San Diego — are staying behind to continue the fight. These Marines are takin... (展开全部)