硫磺制酸装置锅炉系统煮炉期间，锅炉炉水碱度控制在（）左右，磷酸根含量控制在（）左右。
参考答案：50mmol/L；500mg/L
- My friend has achieved his goal after years of hard work. - Great! ________.
A．One tree can't make a forest
B．Where there is a will, there is a way
C．Many hands make light work
D．A friend in need is a friend indeed
Ⅱ型糖尿病（）
A．胰岛β细胞功能减低
B．胰岛β细胞破坏
C．胰岛α细胞破坏
D．甲状腺细胞破坏
E．甲状腺细胞增生
