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【简答题】
Directions: You should write your responses to both Part A and Part B of this section on your ANSWER SHEET. Part A 66. You are the organizer of an English speech contest， and you want to invite a foreign teacher in your school to be a judge. Write an email to him， 1） telling him about the contest（time， location， topic， etc. ）； 2） expressing your hope for his participation and his reply to your message. You should write approximately 100 words. Do not use your own name at the end of your email. Use 'Wang Lin' instead.
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【简答题】已知电路如图a所示，R 1 =R 4 =4Ω，R 2 =R 5 =2Ω，R 3 =1Ω，试求ab端等效电阻。
【简答题】一长为l、重W的均匀梯子,靠墙放置,如图。梯子下端连一劲度系数为k的弹簧。当梯子靠墙竖直放置时,弹簧处于自然长度。墙和地面都是光滑的。当梯子依墙而与地面成q 角且处于平衡状态时, (1) 地面对梯子的作用力的大小为____。 (2) 墙对梯子的作用力的大小为____。 (3) W、k、l、q 应满足的关系式为____。
【简答题】求题如图所示电路中流过检流计的电流I G 。已知U S =6V，R 1 =20Ω，R 2 =80Ω，R 3 =200Ω，R 4 =300Ω，R G =14Ω。
【简答题】如图所示， ，R 1 =R 3 =1.0Ω，R 2 =2.0Ω．R 4 =R 5 =3.0Ω．求：
【简答题】题如图所示电路中，已知：U S =6V，R 1 =4Ω，R 2 =2Ω，R 3 =R 4 =4Ω，求电流I。
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