问题
选择题
Don't pretend __________;after all, we are only lookers-on.
A. to know what is what '
B. to know what was what
C. knowing what is what
D. knowing what was what
答案
答案：A
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Don't pretend __________;after all, we are only lookers-on.
A. to know what is what '
B. to know what was what
C. knowing what is what
D. knowing what was what
答案：A
，
，电源的电动势E=12V，内电阻r=1Ω，安培表的读数I=0.4A。求电阻
的阻值和它消耗的电功率。