阿摩線上測驗
41 A fire extinguisher consists of a hand-held cylindrical pressure vessel containing an ________ which can be discharged to extinguish a fire.
(A)atom
(B)argent
(C)air
(D)agent
答案：登入後查看
統計： A(1), B(0), C(0), D(0), E(0) #3459785
統計： A(1), B(0), C(0), D(0), E(0) #3459785
