A:have been rise
B:have arise
C:have rise
D:have raised
化简AC→-AB→-BD→+CD→得( )
推算
18=2×9
18=6×3
18=____×3
18=____×6
24=____×6
24=____×3
下列对化学反应的认识正确的是
I had a________experience yesterday.The brake of my electrical bike failed and I was very________then.