問題詳情
42. NPN電晶體工作於主動區，其射極流出的電子有0.125 %在基極與電洞結合，其餘 99.875 %被集極收集，則此電晶體之β值為何？
(A) 199
(B) 299
(C) 399
(D) 799
(A) 199
(B) 299
(C) 399
(D) 799
參考答案
無參考答案
內容推薦
- 在絕對零度 (0°K ) 時，於本質半導體之兩端加一電壓，若本質半導體並未發生崩潰，則在本質半導體內狀態為何？(A)有電子流，沒有電洞流 (B)有電子流也有電洞流(C)沒有電子流，有電洞流 (
- (31-32) “Maybe I should put a side table in this corner.”
- 【題組】(１) Here are four sentences from the Word Museum. Which is most likely to appear on the next p
- 相對於單級放大器，有關串級放大器的增益與頻寬之描述，下列何者正確？(A)增益變大，頻寬變寬 (B)增益變大，頻寬變窄(C)增益變小，頻寬變寬 (D)增益變小，頻寬變窄
- 【題組】What did Mr. Chang NOT do for his cows?(A) He fed them with spring water.(B) He touched and
- (48-49)【題組】What does the reading say about the story of the movie?(A) It happens in snowy winter
- 【題組】If Andy picks up his order on May 29 and finds one page missing in Talking Horses,when is th
- 【題組】(A) sing a song(B) read a story(C) draw a picture(D) make a funny face
- (34~35)【題組】 Why was Jenny late?(A) She was sleeping.(B) The train was late.(C) Her clock stopped
- 請閱讀下列敘述後，回答49～50題圖(二十四)為某地的地層剖面圖，甲、乙、丙、丁為不同的岩層，且皆未曾上下翻轉。表(七)為地質年代表，已知此地層剖面中最老的岩層形成於侏羅紀，最年輕的岩層形成於古第三紀
內容推薦
- 如右圖所示，假設兩顆理想二極體具有完全一樣之特性，且並未發生崩潰，請問何者所跨的壓降較大？(A) D1(B) D2(C)一樣(D)無法確定
- 【題組】(A) Also(B) In fact(C) Luckily(D) For example
- 【題組】(A) One(B) Each(C) Another(D) The only
- Unpolarized light of intensityI0is incident on a series of three polarizing filters. The axis of
- 【題組】Which do we know from the reading?(A) Out of the Pages is Sophie Besson’s first movie.(B) Ou
- 請閱讀下列敘述後，回答51～52題老師將「2 個電壓均為 5 V 的電池串聯」，利用導線連接電阻值為 100Ω的電阻器及開關，如圖(二十五)所示。另外附有已連接兩條導線且電阻值為50Ω 的電阻器，
- (50-53) You don’t want to be Kim’s assistant. She gives you lots of work and neverfeels pleas
- 【題組】What can we learn from the reading?(A) Kim’s assistants were all promoted.(B) Ted’s fight wi
- 【題組】Sally is another lawyer in Maureen’s workplace. If Sally agrees with Jackson, whatwould she
- 【題組】(A) have just one chance(B) have to give a different word(C) may look it up in the dictionar
- 【題組】What does the mother think of Stanley?(A) He gets up too early.(B) He is a helpful person.(C
- 【題組】Look at the timetable. Which train did Susan take?(A) 10(B) 50(C) 160(D) 8
- 【題組】(２) What can we learn about the word nice?(A) It started to mean‘clear’around 1500. (B) It was f
- 【題組】Which picture best shows Maureen’s workplace?(A) (B) (C) (D)
- 假設V(t) =V均方根值為v1，當V(t)通過一個理想全波整流器後，其輸出電壓之均方根值為v2，則v1/ v2為何？(A) 0.5 (B) 0.707 (C) 1 (D) 2
- 下列何者是達靈頓(Darlington)放大電路之特點？(A)輸入阻抗低 (B)輸出阻抗高 (C)電流增益低 (D)電壓增益略小於1
- 【題組】若要將兩圖中的電路連接為兩個電阻器並聯的電路，採取下列哪個步驟即可完成？(A)將 T 連接 Q，U 連接 R (B)將 T 連接 S，U 連接 R(C)將 T 連接 P，U 連接 Q
- Below is an ad of a restaurant.【題組】(１) Four people have called Ms. Wu. Below are Ms. Wu’s notes ab
- 【題組】What does this way mean?(A) Singing to a crying baby.(B) Singing when taking a cold bath.(C)
- 電壓 ，當 t = 0秒時瞬間電壓為何？(A) 25 V (B)40 V (C)50 V (D) 40 V
- 【題組】(A) TEN(B) RED(C) EAT(D) AGE
- 請閱讀下列敘述後，回答53～54題溫室氣體能吸收地表輻射熱，使氣溫升高，排放 過量會造成全球暖化。表(八)列出四種溫室氣體的全 球暖化潛勢 (GWP)，這是指與 CO2 相比，造成全球暖 化的相對能力
- 【題組】Mr. Brown, a PE teacher, took his students to the club. There they watched early tennis game
- 【題組】What does black or white mean in the reading?(A) Now or then.(B) Right or wrong.(C) Two brok
- (36~37)【題組】 What is the writer asking for?(A) A safe way to take a trip.(B) A chance to go his o