问题
选择题
Do you like the ________ magazine __________Zhi Yin? [ ]
A. month; calling
B. monthly; called
C. month; called
D. monthly; calls
答案
答案：D
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Do you like the ________ magazine __________Zhi Yin? [ ]
A. month; calling
B. monthly; called
C. month; called
D. monthly; calls
答案：D
v/aB，正电荷
v/aB，负电荷