10. 後燃期佔全燃燒期間約多少?
(A)30%
(B)40%
(C)50%
(D)60%
答案:登入後查看
統計: A(39), B(20), C(135), D(18), E(0) #2810985
統計: A(39), B(20), C(135), D(18), E(0) #2810985