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(48), B(61), C(366), D(33), E(0) #3246809
統計: A(48), B(61), C(366), D(33), E(0) #3246809