A 9-year-old child is in diabetes. The nurse offers to meet with the mother and the child’s teacher before school to discuss the teacher’s responsibilities in relation to the child’s diabetes. Which of the following would the nurse expect to discuss in this meeting

A. How to perform a glucometer test.
B. How to give an insulin injection.
C. Signs and symptoms of hypoglycemia.
D. The American Diabetic Association (ADA) diet.

关于浓差电池（作图）下列叙述正确的是（）。

A. 标准电动势E^Θ≠0，电动势E=0

B.标准电动势E^Θ=0，电动势E=0

C. 标准电动势E^Θ=0，电动势E=0

D. 标准电动势E^Θ≠0，电动势E≠0