皮皮学,免费搜题
登录
搜题
【单选题】
听力原文: A new United Nations report is predicting economic growth in Latin America this year will be slower than anticipated. The U. N, Economic Commission for Latin America and the Caribbean released a survey Tuesday projecting three percent growth in the region. In February, the com-mission forecast a growth rate of three-point-eight per-cent. The regional economy grew by four percent last year. Economists with the U.N. committee, based in Santiago, Chile, say the slowing U. S. economy is the primary factor in Latin America’s economic slowdown. The committee says a decline in direct foreign investment also played a part in the revised economic forecast. The U. N. agency is forecasting a good year for Brazil--which has Latin America’s largest economy. The commission predicts the Brazilian economy Will expand by four percent this year. The Dominican Republic and Chile also get high marks. The U. N. office says Colombian, Ecuador and Venezuela will continue a steady recovery from economic instability. ________ people died in the powerful storm.
A.
55
B.
65
C.
60
D.
45
拍照语音搜题,微信中搜索"皮皮学"使用
参考答案:
参考解析:
知识点:
.
..
皮皮学刷刷变学霸
举一反三
【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
【单选题】对理想光学系统来说
A.
有焦点、节点、主点三种基点
B.
有焦点、节点、结点三种基点
C.
有结点、节点、主点三种基点
D.
有焦点、节点、光心三种基点
【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】怎样才能学好操作系统? “操作系统”是计算机专业的一门必修课程。操作系统是管理计算机硬件与软件资源的计算机程序,同时也是计算机系统的内核与基石。 毕竟我们来到大学,投入三年的大好时光,一路过关斩将,为的不仅是一纸文凭,更不是纸面上的分数。学习知识、提升能力、掌握技术,为了不负好时光,也为了在学业与今后的事业上有所斩获,请大家在结合课前热身所学知识,结合自己的特点,想一想操作系统概论这门课要怎样去学...
【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 ...
相关题目: