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【判断题】
功率直流稳压电源系统由电源变压器、整流、滤波电路组成。 ( )A.
正确
B.
错误
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【简答题】牛顿公式和高斯公式都可以用来计算理想光学系统的成像位置,二者等价。不同的是物像距表征时所选用的原点不同,牛顿公式中以焦点为原点,高斯公式中以主点为原点。
【判断题】牛顿公式和高斯公式都可以用来计算理想光学系统的成像位置,二者等价。不同的是物像距表征时所选用的原点不同,牛顿公式中以焦点为原点,高斯公式中以主点为原点。
A.
正确
B.
错误
【简答题】什么是光学仪器的像分辨本领?若光的衍射现象完全可以忽略，对理想光学系统成像来说，还存在分辨本领这个问题吗?望远镜、显微镜和照相物镜的分辨本领各用什么量表示?决定于什么?
【单选题】The more one is _________ the English-speaking environment, the better he or she will learn the language． [ ]
A.
exposed to
B.
filled in
C.
caught on
D.
kept up
【单选题】What happened after Lang Lang started studying with the second piano teacher?
A.
He was still criticized by his second teacher.
B.
He lost his confidence little by little.
C.
His father found a new job in Beijing.
D.
His future began to take on a new look.
【单选题】In the International Young Pianists Competition, when it was________that Lang Lang had won, he was too excited to hold back his tears. [ ]
A.
told
B.
mentioned
C.
announced
D.
recognized
【简答题】高斯光学系统又称为理想光学系统，是1841年由德国科学家（ ）建立起来的。
【简答题】Lang Lang, the young Chinese pianist, was born in Shenyang in 1982. He began to play the piano when he was 3. At the age of 5, he won first place in a piano competition in Shenyang. People thought he ...
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