42 Proper sprinkler systems should be_________ in all buildings to release water onto fire.
(A)gratified
(B)installed
(C)disguised
(D)oriented
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統計: A(24), B(347), C(38), D(20), E(0) #1217047
統計: A(24), B(347), C(38), D(20), E(0) #1217047