题目:
It is important to have your eyes examined regularly to check for any sign of eye disease that may not
have any ________. [ ]
A. symptom
B. similarity
C. sample
D. shadow
答案:
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0.4A 0.8A 8V 8V 8V 题目分析:由于电源是由4节新的铅蓄电池串联组成,所以电源电压是8V,所以电压表的示数是8V;如图所示,两灯泡是并联,所以两灯泡两端电压都为8V;一只电流表在干路上,另一只在支路...