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【单选题】
能促进维生素D形成的是
A.
长波紫外线
B.
长波红外线
C.
中波紫外线
D.
短波紫外线
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【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 。
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【多选题】关于去除湿物料中水分的叙述正确的是
A.
难以完全除去结合水
B.
物料不同，在同一空气状态下平衡水分不同
C.
不能除去平衡水分
D.
非结合水分易于除去
E.
干燥过程中仅可除去自由水分
查看完整题目与答案
【单选题】—Does your pen pal speak English or French? —_____. [     ]
A.
Yes, he speaks English
B.
No, he doesn't speak French
C.
He speaks French
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【简答题】电路如图所示,已知R1 = R3 = 2Ω, R2= 5Ω, R4 = 8Ω, R5 =14Ω, E1= 8V, E2 = 5V, IS= 3A。求电路中的电流 I。
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【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...
查看完整题目与答案
【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.
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【单选题】.干燥过程中不易除去的水分是( )
A.
平衡水
B.
自由水分和平衡水分之和
C.
自由水
D.
结合水
E.
非结合水
查看完整题目与答案
【单选题】( )2.She doesn't speak her friend, but her written work is excellent.
A.
as well as
B.
so often as
C.
so muchas
D.
as good as
查看完整题目与答案
【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.
查看完整题目与答案
【多选题】关于去除湿物料中水分的叙述正确的是
A.
不能除去结合水
B.
物料不同，在同一空气状态下平衡水分不同
C.
不能除去平衡水分
D.
非结合水分易于除去
E.
干燥过程中仅可除去自由水分
查看完整题目与答案
相关题目：
【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 。
查看完整题目与答案
【多选题】关于去除湿物料中水分的叙述正确的是
A.
难以完全除去结合水
B.
物料不同，在同一空气状态下平衡水分不同
C.
不能除去平衡水分
D.
非结合水分易于除去
E.
干燥过程中仅可除去自由水分
查看完整题目与答案
【单选题】—Does your pen pal speak English or French? —_____. [     ]
A.
Yes, he speaks English
B.
No, he doesn't speak French
C.
He speaks French
查看完整题目与答案
【简答题】电路如图所示,已知R1 = R3 = 2Ω, R2= 5Ω, R4 = 8Ω, R5 =14Ω, E1= 8V, E2 = 5V, IS= 3A。求电路中的电流 I。
查看完整题目与答案
【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...
查看完整题目与答案
【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.
查看完整题目与答案
【单选题】.干燥过程中不易除去的水分是( )
A.
平衡水
B.
自由水分和平衡水分之和
C.
自由水
D.
结合水
E.
非结合水
查看完整题目与答案
【单选题】( )2.She doesn't speak her friend, but her written work is excellent.
A.
as well as
B.
so often as
C.
so muchas
D.
as good as
查看完整题目与答案
【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.
查看完整题目与答案
【多选题】关于去除湿物料中水分的叙述正确的是
A.
不能除去结合水
B.
物料不同，在同一空气状态下平衡水分不同
C.
不能除去平衡水分
D.
非结合水分易于除去
E.
干燥过程中仅可除去自由水分
查看完整题目与答案