中心暗场像
参考答案:
用物镜光阑挡住透射束及其余衍射束,而只让一束强衍射束通过光阑参与成像的方法,称为暗场成像,所得图象为暗场像。如果物镜光阑处于光轴位置,所得图象为中心暗场像。
______ made the parents proud was ______ their daughter had been admitted into Peking University.
A.What; that
B.What; because
C.That; what
D.That; because
“青槐夹两道,白马如流星。”出自哪位诗人的哪部作品?