29. Before lifeboat drills, please make sure the ______ tracks are in good order and condition.
(A) orbit
(B) launching
(C) ambit
(D) circuit
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統計: A(7), B(17), C(2), D(5), E(0) #3833743
統計: A(7), B(17), C(2), D(5), E(0) #3833743