下列关于电磁知识的说法正确的是[ ] A．奥斯特发明了发电机_爱下问搜题

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问题选择题

下列关于电磁知识的说法正确的是[ ]

A．奥斯特发明了发电机

B．电磁铁磁性强弱只与线圈匝数有关

C．电动机是利用电磁感应现象制成的

D．电磁继电器是利用电磁铁控制工作电路通断的开关

答案

答案：D

单项选择题

某客户购买了A公司的股票，该公司年末股权收益率为10%，留存比率为30%假设该公司可以实现收益和红利的持续增长，则股利增长率为（）。

A.3%

B.5%

C.4%

D.6%

填空题

阅读下面短文，从所给单词中选出适当单词，并用其正确的语言形式填在标有题号的空白处，使语意通顺完整。(每空一词，每个单词只能使用一次)

child time in good ready begin
pass quickly themselves for if hard

      Each year, thousands of Chinese middle school students go to study in foreign countries such as the US, the UK, Australia and Japan.
"Chinese   6  hope very much to go abroad to get a wider view (视野) of the world," said Li Mingshan, a Chinese writer who has lived   7   America for many years. In a talk Li told more than 300 parents and their children that life in foreign countries can be   8  for young people. "They have to meet a culture shock and language problems.”
However, these are not the most difficult things. To most children, looking after   9  when studying alone in a foreign country is a big challenge (挑战).
Zhao Baohua, a 16-year-old student   10  to study in a high school in Australia last October. To his surprise, his teachers there hardly pushed students to study. And usually there wasn't homework. "With these education systems, we have more free   11  and more space for thinking," said Zhao. "But   12  you don't know how to plan your time and money, you will not have an easy time." Some of his friends spent their whole year's money in the first two months of the term, and they didn't   13  their exams.
"Studying abroad at a young age can help students learn foreign languages   14 , but students and parents should know about the challenges," Li said. "If you want to study abroad, try to talk to someone with experience in foreign countries. Make sure that you are   15  for it. "