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5. 有一根金屬導線之電阻為R,若將其長度均勻拉長3倍後,則導線電阻變為多少?(A)R/9 (B)R/3 (C)3R (D)9R
問題詳情
5. 有一根金屬導線之電阻為R,若將其長度均勻拉長3倍後,則導線電阻變為多少?
(A)R/9
(B)R/3
(C)3R
(D)9R
參考答案
答案:D
難度:
計算中
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4. 欲判斷載流導體在磁場中之受力關係,可由「佛來銘左手定則」決定。有關其左手之拇指代表之意義為何?僅供參考(A)磁場移動方向(B)導體運動方向(C)電子運動方向(D)磁力線方向
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6. 有一台4馬力的直流電動機,其額定電壓為100V,額定電流為40A,求電動機的滿載效率約為何?(A)80% (B)75% (C)60% (D)50%
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7. 有一個線圈匝數為600匝,電感量40mH,若將匝數減少為150匝,則線圈電感量變為何?(A)10mH (B)7.5mH (C)2.5mH (D)1mH
8. 有一個蓄電池以定電流方式連續充電720分鐘後,其充電量累積達到90安培小時(AH)。求充電電流大小為何?(A)7.5A (B)8A (C)8.5A (D)9A
9. 有兩個規格均為110V/10W之白熾燈泡,將其分別並聯與串聯接於110V電源時。求並聯連接時之燈泡總功率為串聯連接時的幾倍?(A)2倍 (B)4倍 (C)1/2倍 (D)1/4倍
32 Tim has booked a ticket to Chicago and _____ a single room at the hotel.(A) deserved (B) conserve
33 After she graduates from college next year, she will _____ as an elementary school teacher.(A) co
34 It is _____ that an ancient artifact shows wear and tear after thousands of years.(A) imprudent (
35 Durian has such a _____ smell that, in most cases, people love it or hate it.(A) generous (B) fre
36 John drank a lot of beer and whisky and got completely drunk last night because all the alcoholic
37 Mrs. Wong _____ her new-born baby very much, so she already made many plans for its future.(A) ad
38 This shrine is _____ to the memory of soldiers killed in the defense of the country.(A) dedicated
39 A person with a(n) _____ attitude often feels a task is too difficult to complete before actually
40 Some women suffering from _____ violence choose to remain silent because of their children.(A) do
請依下文回答第 41 題至第 45 題:Communication is crucial for a social species and particularly for human infants
【題組】42 (A) hear (B) plan (C) read (D) tell
【題組】43 (A) which (B) what (C) where (D) that
【題組】44 (A) Before (B) Lest (C) Shortly (D) Once
【題組】45 (A) estimate (B) placement (C) objection (D) treatment
請依下文回答第 46 題至第 50 題:Cheese is a dairy product, derived from milk and produced in wide ranges of flav
【題組】47 Which of the following is closest in meaning to “drained”?(A) Put out. (B) Added into. (C) Ca
【題組】48 According to the passage, which of the following is necessary to the process of “fermentation
【題組】49 According to the passage, which of the following does pasteurization require?(A) Adding cultu
【題組】50 Which of the following is true according to the passage?(A) The ripened milk forms a curd tha
10. 已知交流電路之瞬間值方程式如下: = 100sin(377t +30°)V, = -10cos(377t +60°)A ,則電壓與電流之相位關係為何?(A)電壓超前電流30°(B)電壓超前
【題組】(d) (7%) Under what conditions on ayi for i, j = 1,... ,n will matrix A be an upper-triangularon
2 根據入出國及移民法第 72 條,內政部移民署執行查察逾期停留、居留、非法入出國、收容或遣送職務之人員,得配帶戒具或武器。遇有下列何種情形,得使用武器? (A)有抗拒之行為(B)逃亡或有逃亡之虞(C