3.在图2中,AB间的电压力30V,改变滑动变阻器触头的位置,可以改变CD间的电压,UCD的变化范围是 [ ]
A.0-10V B.0-20V
C.10V-20V D.20V-30V
1.电阻R1、R2、R3串联在电路中。已知R1=10Ω、R3=5Ω,R1两端的电压为6V,R2两端的电压为12V,则 [ ]
A.电路中的电流为0.6A B.电阻R2的阻值为20Ω
C.三只电阻两端的总电压为21V D.电阻R3消耗的电功率为3.6W
2.如图1所示,电源和电压表都是好的,当滑片由a滑到b的过程中,电压表的示数都为U,下列判断正确的是 [ ]
A.a处接线断开 B.触头P开路
C.a、b间电阻丝开路 D.b处接线开路
93. –Who taught you to play volleyball?
--Nobody, I learnt it by ______. (09随州)
A. me B. my C. myself
答案:C
92. –What are you doing this weekend?
--I want to do _______. (09贵港)
A. something different B. different something
C. anything different D. different anything
答案:A
91. Friends like you make _____ a lot easier to get along in a new place. (09枣庄)
A. me B. that C. you D. it
答案:D
90. –Excuse me. Is this ______ book, Kangkang?
--No, it’s not ______. (09益阳)
A. yours, mine B. your, mine C. your, my
答案:B
89. –What do you think of the street?
--Very beautiful. There are many tall trees on ______ side of it. (09益阳)
A. either B. both C. every
答案:A
88. –Is this the Greens’ house?
--No. _______ is over there. (09 威海)
A. His B. Their C. Theirs D. Them
答案:C
87. The doctor advised Elsa strongly that she should take a good rest, but ____ didn’t help. (09南京)
A. she B. it C. which D. he
答案:B
86. –Are the keys over there ______?
--No. Go and ask Anna. They may belong to her. (09南京)
A. you B. your C. yours D. yourself
答案:C
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