阿摩線上測驗
40 In order to extinguish an indoor fire quickly, the ________ could be mounted on the ceiling of every room in the house.
(A) fire extinguisher
(B) smoke detector
(C) fire alarm
(D) fire sprinkler system
答案：登入後查看
統計： A(33), B(92), C(51), D(160), E(0) #2355278
統計： A(33), B(92), C(51), D(160), E(0) #2355278
