複選題
8. 如圖所示，有一步進馬達驅動一組定位工作平台，此步進馬達之全步進角度為(θ)，馬達輸出軸配有一減速比(i)之減速齒輪組，齒輪組之輸出軸接至導螺桿。若導螺桿每轉動 10 圈，滑台移動 \(50 \mathrm{~mm}\)，下列敘述哪些正確？
(A)若 \(\theta = 1.8^{\circ}\)、i = 1:10，滑台定位之解析度 \(R = 2 \mu \mathrm{m}\)
(B)若 \(\theta = 0.9^{\circ}\)、i = 1:12.5，滑台定位之解析度 \(R = 1.0 \mu \mathrm{m}\)
(C)若 \(\theta = 0.72^{\circ}\)、i = 1:5，滑台定位之解析度 \(R = 2 \mu \mathrm{m}\)
(D)若 \(\theta = 0.36^{\circ}\)、i = 1:10，滑台定位之解析度 \(R = 2.5 \mu \mathrm{m}\)。