1 如圖所示,二極體VD = 0.7V,求當 V1 = 40V、V2 = 0V、V3 = 25V、V4 = 5V、R1 = 20kΩ、R2 = 1kΩ、R3 = 1kΩ時,求 I1及VO分別為多少?	  
	
								A 3.6mA,4.3V
 								
								B 1.9mA,0.9V 
								
								C 0mA,3.8V 
								
								D 2mA,40V
								
								
									
							
							
															
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