10. Please refer to the attached sextant figure, the part that marked 「C」is:
(A) Horizon glass
(B) Horizon shade glass
(C) Index mirror
(D) Index shade glasses
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統計: A(492), B(109), C(124), D(58), E(0) #2929013
統計: A(492), B(109), C(124), D(58), E(0) #2929013
