问题
选择题
—______ for one cake?
—Twenty yuan. [ ]
A. How many
B. How
C. How much
D. What
答案
答案：C
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—______ for one cake?
—Twenty yuan. [ ]
A. How many
B. How
C. How much
D. What
答案：C
c从无穷远处移到P点，电场力做了2.0×10
J的功。设无穷远处电势为零，则P点的电势为 V。Q点电性为 电荷。