问题
选择题
如图所示，A、B、C、D是滑动变阻器的四个接线柱，将该变阻器与一个小灯泡串联后接在电源上，通电后使滑片P向左移动，小灯泡逐渐变暗，由此判断该滑动变阻器接入电路的两个接线柱应为[ ]
A．接线柱A、D
B．接线柱B、D
C．接线柱C、D
D．接线柱A、B
答案
答案：B
搜题请搜索小程序“爱下问搜题”
如图所示，A、B、C、D是滑动变阻器的四个接线柱，将该变阻器与一个小灯泡串联后接在电源上，通电后使滑片P向左移动，小灯泡逐渐变暗，由此判断该滑动变阻器接入电路的两个接线柱应为[ ]
A．接线柱A、D
B．接线柱B、D
C．接线柱C、D
D．接线柱A、B
答案：B
小题1:_It has around 3 billion fans - nearly half the world’s population! And about  300 million people play this game. That's 4 percent of the world' s population!小题2:_Many people in old days played early forms of his modern game. Cu ju (蹴鞠） a ball-kicking game in China, was reported as early as 2500 B.C. Around the same time in Greece, people were also playing a similar ball game without using their hands. But modern soccer didn't become official (官方的) until 1863. An Englishman called Cobb Morley introduced the idea of a soccer association (联盟). 小题3:____. From then on, other associations in the countries were set up. They came together-to make up the FIFA, which organizes the World Cup. It's not easy to tell what makes soccer so popular. 小题4:___ Soccer needs only two feet and a ball. This makes it a sport that developing countries can easily play. Some of the sport's best players come from these poor nations. 小题5:_The sport's no-harids rule makes beautiful dance-like movements on the field. What's more, this sport excites the heart. Teams might score only a few times each match, so matches can turn around suddenly. No one knows who will win at the next World Cup. But one thing is certain: The world will be watching.
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