试题与答案

下列两图中,开关S断开时,小磁针静止在图甲所示的位置;开关S闭合时,小磁针静止在

题型:选择题

题目:

下列两图中,开关S断开时,小磁针静止在图甲所示的位置;开关S闭合时,小磁针静止在图乙所示的位置。由此可知:(   )

A.a端是电磁铁N极,c端是电源正极

B.a端是电磁铁N极,c端是电源负极

C.b端是电磁铁N极,d端是电源正极

D.b端是电磁铁N极,d端是电源负极

答案:

答案:D

试题推荐
题型:单项选择题

The world has never been more closely and intricately connected. Our behavior (51) the environment we all share, and we are tied into a global economy and global communication system. (52) choosing to buy one garment rather than another we help determine whether someone on the other side of the world retains or (53) their job; emissions from one part of the world contribute to a hole in the ozone layer somewhere else; we can (54) with others anywhere via satellites, the Internet and the mobile phone. This interdependency, (55) "connexity", is the defining characteristic of the world today.

However, despite connexity, human beings have also (56) been, more separate. Belief in individual rights and freedoms is at the heart of the West’s world view. People nowadays insist their freedom to (57) how to live, who to love, what to consume and what to believe. In economics, the sovereignty of the consumer and the shareholder is paramount. In politics, the sovereignty of nations remains a (58) concern.

In this inspiring and important book Mulgan argues that our freedom and our connectedness are set or collision course and argues that the (59) way out of our current impasse (僵局) is to go beyond our sense of ourselves as (60) unit, and recognize the webs of mutual responsibility in which we live.

60().

A.isolated 

B.isolation 

C.isolating 

D.isolate

查看答案
微信公众账号搜索答案