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I used to go to the gym three times a week, but I don't _______ _______ (锻炼) any more.
1年前
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
He can’t____ ( 负担得起 ) to pay for his child’s education.
1年前
The land in the southwest of China is in great need of _______.
1年前