【简答题】电路如图所示, 已知 R 1 = R 3 =2 W , R 2 =5 W , R 4 = 8 W , R 5 =14 W , E 1 = 8V , E 2 = 5V , I S = 3A ,则用戴维南定理求图示电路中的电流 I 时,戴维南等效电路的 U oc 为 _________V ,等效内阻为 __________ Ω,图中 电流 I 为 __________ A 。
【单选题】—Does your pen pal speak English or French? —_____. [ ]
A.
Yes, he speaks English
B.
No, he doesn't speak French
【简答题】Mary is an American schoolgirl. 小题1: . She doesn’t know Chinese, but she is trying to study and speak it. 小题2: . Sometimes they don’t understand her, because she can’t speak Chinese well. It’s Saturda...
【单选题】Which of the italicized parts functions as an object?
A.
He doesn't like the idea of my speaking at the meeting.
B.
It is no use your pretending not to know the matter.
C.
Her falling into the river was the climax of the whole trip.
D.
My parents strongly object to my going out alone at night.
【多选题】下列有关干燥的描述哪些是正确的( )
A.
自由水在干燥过程中易于除去,平衡水不易于除去,平衡水不仅与物资性质有关,也与空气状态有关。
B.
在干燥速率曲线中存在着恒速段,其主要是因为表面水的汽化速度大于内部水分向表面的迁移速度。
C.
冷冻干燥机有二大部分组成即真空系统和制冷系统。
D.
微波干燥器加热迅速、均匀、干燥速度快、热效率高
【单选题】( )2.She doesn't speak her friend, but her written work is excellent.
【简答题】A. He doesn' t like to work hard. B. He thinks the pay is too low. C. He doesn't want to spend too much time working. D. He thinks it' s too far away from his home.