關(guān)于膠片本底灰霧的敘述，錯誤的是
A、是照射量等于零時照片所具有的密度值C
暫無解析
We___youforthespecialofferyousendus.()
_______thefirstlanguageisusedintheteachingofthesecondlanguageintheGrammar-TranslationMethod.
________youhadbeenhere,wewouldn’thavehadsomuchtroublethen.
翻譯：Sineethepremiumvarieswiththescopeofinsuranee,extrapremiumisforbuyer'saeeount,shouldadditionalrisksbecovered.
Inourdepartment,everystudent_________after-schoolactivities.
