阿摩線上測驗
5. Please refer to the attached sextant figure, the part that marked 「F」is:
(A) Index arm
(B) Micrometer drum
(C) Release lever
(D) Limb
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統計： A(44), B(529), C(101), D(45), E(0) #2883484
統計： A(44), B(529), C(101), D(45), E(0) #2883484
