题干
Not until the motorbike looked almost new ______repairing and cleaning it.
A：he stopped
B：did he sto
C：stopped he
D：he did sto
答案(点此获取答案解析）
B
Y+Z,其化学反应速率随时间变化的图像如图所示，其中t1时刻达到平衡，t2时刻缩小容器体积，t3时刻重新达到平衡，下列有关说法不正确的是( )
