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(2017 桂林改编)My hometown is ________ famous for its beautiful mountains and clear water.
4个星期前
We should study in a ________ method, or it may be a waste of time.
1个月前
Oh, Richard, why ________you always do the opposite of what I tell you?
1年前
闭合开关S后,小磁针静止时北极的指向如图所示,则螺线管左端是______极(选填“N”或“S”),电源左端是______极(选填“正”或“负”).
1年前
1年前