3.在圖2中,AB間的電壓力30V,改變滑動(dòng)變阻器觸頭的位置,可以改變CD間的電壓,UCD的變化范圍是 [ ]
A.0-10V B.0-20V
C.10V-20V D.20V-30V
1.電阻R1、R2、R3串聯(lián)在電路中。已知R1=10Ω、R3=5Ω,R1兩端的電壓為6V,R2兩端的電壓為12V,則 [ ]
A.電路中的電流為0.6A B.電阻R2的阻值為20Ω
C.三只電阻兩端的總電壓為21V D.電阻R3消耗的電功率為3.6W
2.如圖1所示,電源和電壓表都是好的,當(dāng)滑片由a滑到b的過(guò)程中,電壓表的示數(shù)都為U,下列判斷正確的是 [ ]
A.a(chǎn)處接線斷開(kāi) B.觸頭P開(kāi)路
C.a(chǎn)、b間電阻絲開(kāi)路 D.b處接線開(kāi)路
93. –Who taught you to play volleyball?
--Nobody, I learnt it by ______. (09隨州)
A. me B. my C. myself
答案:C
92. –What are you doing this weekend?
--I want to do _______. (09貴港)
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棗莊)
A. me B. that C. you D. it
答案:D
90. –Excuse me. Is this ______ book, Kangkang?
--No, it’s not ______. (09益陽(yáng))
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益陽(yáng))
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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