用戶【ijnijn】點評問題和點評內容

【評論主題】40. 正弦波電壓一般式為v(t)=100 sin(377t) V,下列敘述何者正確?(A) Vrms = 100V (B) f = 377Hz (C) VP-P = 200V (D) T = 1/6

【評論內容】

Vm=100

W=2拍f=377

T=1/f

Vp-p=2Vm

Vrms=Vm/√2=110/√2=55√2V

f=377/2拍=60Hz

Vp-p=2Vm=200V

T=1/f=1/60s

【評論主題】16. We avoided _____ through downtown because of the heavy traffic last night.(A) driving (B)drive (

【評論內容】

我們避免開車前往鬧區因為繁忙的交通

【評論主題】15. We’d better stop at the gas station, ______ we’ll soon run out of gas.(A) so (B) but (C) also (D

【評論內容】

我們最好停在瓦斯站,否則我們不久將用盡瓦斯.

【評論主題】13. American researchers have found out that the blood vessels of obese teenagers look like_____ of

【評論內容】

美國研究人員發現過胖的青少年的血管像老人的血管.

researchers 研究人員

found out 發現

blood vessels 血管

obese 過胖的

teenagers 青少年

look like 像

【評論主題】6. Faced with the evidence, he _____ himself guilty in front of the judge.(A) conformed (B) mistook

【評論內容】

證據擺在眼前,他承認他自己有罪在之前的審判.

evidance 證據

guilty 有罪的,犯...罪的

judge 審判

【評論主題】23 如圖所示之電路中,已知 I = 1A 時,則電源電壓 E 為多少伏特?   (A) 108  (B) 120 (C) 216(D) 240

【評論內容】

I=1A流過20歐姆和40歐姆----Vab=IR=1*(20+40)=60V

30歐姆//(20歐姆+40歐姆)----Rab=30//(20+40)=20歐姆

E*20/(20+60)=60V ----------E=60*80/20=240V

【評論主題】40. 正弦波電壓一般式為v(t)=100 sin(377t) V,下列敘述何者正確?(A) Vrms = 100V (B) f = 377Hz (C) VP-P = 200V (D) T = 1/6

【評論內容】

Vm=100

W=2拍f=377

T=1/f

Vp-p=2Vm

Vrms=Vm/√2=110/√2=55√2V

f=377/2拍=60Hz

Vp-p=2Vm=200V

T=1/f=1/60s

【評論主題】15. We’d better stop at the gas station, ______ we’ll soon run out of gas.(A) so (B) but (C) also (D

【評論內容】

我們最好停在瓦斯站,否則我們不久將用盡瓦斯.

【評論主題】6. Faced with the evidence, he _____ himself guilty in front of the judge.(A) conformed (B) mistook

【評論內容】

證據擺在眼前,他承認他自己有罪在之前的審判.

evidance 證據

guilty 有罪的,犯...罪的

judge 審判

【評論主題】16. We avoided _____ through downtown because of the heavy traffic last night.(A) driving (B)drive (

【評論內容】

我們避免開車前往鬧區因為繁忙的交通

【評論主題】13. American researchers have found out that the blood vessels of obese teenagers look like_____ of

【評論內容】

美國研究人員發現過胖的青少年的血管像老人的血管.

researchers 研究人員

found out 發現

blood vessels 血管

obese 過胖的

teenagers 青少年

look like 像

【評論主題】9. There is no _____ for hard work when trying to achieve a high standard in any professionalfield.(

【評論內容】

當試著達到一個高標準在任何專業領域 , 努力是不能代替的 . 

substitute 代替

avhieve 完成 , 達到

standard 標準

peofessional 專業的

field 領域

【評論主題】23 如圖所示之電路中,已知 I = 1A 時,則電源電壓 E 為多少伏特?   (A) 108  (B) 120 (C) 216(D) 240

【評論內容】

I=1A流過20歐姆和40歐姆----Vab=IR=1*(20+40)=60V

30歐姆//(20歐姆+40歐姆)----Rab=30//(20+40)=20歐姆

E*20/(20+60)=60V ----------E=60*80/20=240V