阿摩線上測驗
4. Please refer to the attached sextant figure, the part that marked 「A」is:
(A) Horizon shade glasses
(B) Horizon glass
(C) Index mirror
(D) Limb
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統計： A(52), B(72), C(407), D(34), E(0) #3246809
統計： A(52), B(72), C(407), D(34), E(0) #3246809
