激活糜蛋白酶原的是
A.肠致活酶
B.胰蛋白酶
C.盐酸
D.组胺
E.辅酷酶
参考答案:B
硫代硫酸钠溶液与稀硫酸反应的化学方程式为:Na2S2O3+H2SO4=Na2SO4+SO2+S↓+H2O,下列各组实验中最先出现浑浊的是[ ]
反应温度/℃ Na2S2O3溶液V/mL c/mol/L 稀H2SO4V/mL c/mol/L H2OV/mL
A. 25 5 0.1 10 0.1 5
B. 25 5 0.2 5 0.2 10
C. 35 5 0.1 10 0.1 5
D. 35 5 0.2 5 0.2 10
单词拼写。
1. How's the ________ (天气) in Chongqing?
2. Thank you for j________ (参加) CCTV's "Around the World" show.
3. What's he doing? He's ________ (谈话) with Tom.
4. I don't like going shopping in this ________ (热度).
5. T________ (贼) don't like me.