The interviewee has been studying___________________for quite a long time, since she was_______________________.
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During these years when she lived with the animals she has been recording their_____________and watching their ___________very closely. Now she is training___________________to work with her
电路由()、负载、导线、开关这四个基础部分组成
A. 电阻
B. 电源
C. 电容
D. 电感
电流的国际单位是()
A(安培)
B. V(伏特)
C. Ω(欧姆)
D. H(亨利)
电压的国际单位是()
A(电流)
B. V(伏特)
C. Ω(欧姆)
D. H(亨利)