(1)将等质量的Zn粉分别投入:试管A:10mL 0.1mol•L﹣1 HCl和试管B:10mL 0.1mol•L﹣1醋酸中:开始时,反应速率A____ B(填>,=或<,下同),若Zn过量,产生H2的体积A____ B.
(2)将等质量Zn粉分别投入pH=1体积均为10mL的试管A:盐酸和试管B:醋酸中:开始时,反应速率A____ B(填>,=或<,下同),若Zn过量,产生H2的体积A____ B.
It is Saturday morning. The sky is blue. My father and I are going to the park. There are a lot of people in the park. Some children are running on the grass. A dog is running after them. Some men are sitting on the grass. They are talking. Two girls are flying a nice kite. Three women are standing under a tree, and they are watching the children playing. There is a boat in the lake and two women are boating. Everyone in the park is very happy.
用“>” “<” “=”填空
①50mL酒精与50mL水混合后体积____ 100mL.
②50℃时熟石灰的溶解度____20℃时熟石灰的溶解度.
③20℃时40g氯化钠加入100g水中,充分搅拌,形成溶液的质量____140g.
(20℃时氯化钠的溶解度为36g)
④20℃时KNO3的溶解度为31.6g,则20℃时其饱和溶液的溶质质量分数____31.6%.
运行如图所示框图,坐标满足不等式组x+y-3≥0x-y+2≥0x≤3的点共有____ 个.
读我国冬季风、夏季风示意图,回答下列问题