2，(9- 1) × 3 = 24m。
3.8 The space between clothes needs 7 clips, 2 clips on both sides and 9 clips for * * *.
4,6 ÷ (4-1) = 2 seconds, 2 seconds between every two strokes,
2×( 12- 1)=22 seconds,
It lasted for 22 seconds.
Excuse me, what courses are offered in the pharmacy major of China Pharmaceutical University?
Shenyang Pharmaceutical university