题目内容
(请给出正确答案)
[多选题]
新S1中,Practical Reading包含哪些教学环节()
A.Pre-Reading
B.Intro and Picture Walk
C.Target Reading
D.Independent Reading
E.Post Reading
答案
ABDE
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A.Pre-Reading
B.Intro and Picture Walk
C.Target Reading
D.Independent Reading
E.Post Reading
ABDE
A.Explore text by reading a fiction with character
B.Develop listening skills by hearing a text read aloud
C.Analysis the main idea of a passage by using a specific graphic organizer
D.Apply the previous knowledge to analysis the text
A.Uu、X1、S2
B.Uu、X2、S1
C.X1、X2、S1
D.Uu、S1、S2
在图18.18所示的整流电路中,已知变压器二次侧电压的有效值U=20V,负载电阻RL=50Ω。试分别计算开关S1~S4在不同合断情况下,负载两端电压Uo,电流Io,每个二极管中流过的电流ID和承受的最高反向电压URM。设R=20Ω。
(1)S1和S2合上,其他断开;
(2)S1合上,其他断开;
(3)S1~S4均合上;
(4)S1,S3,S4合上,S2断开;
(5)S1~S4均断开。