問題詳情
【題組】36 The function of the glass in the first flashbulbs was to
(A)produce the spark that initiated the flash
(B)magnify the light produced by the flash
(C)protect the photographer from the heat of the flash
(D)keep the metal and oxygen apart before the flash
參考答案
答案：D
難度：非常困難0
統計：A(0),B(0),C(0),D(0),E(0)