阿摩線上測驗
51 One of the most important items of personal protective equipment used by firefighters and rescue personal is “self-___________t breathing apparatus,” which ensures the automatic and sufficient breathing of the firefighter staff member.
(A)contained
(B)maintained
(C)sustained
(D)extended
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統計： A(42), B(42), C(31), D(7), E(0) #1217056
統計： A(42), B(42), C(31), D(7), E(0) #1217056
