一生不变的面色是（）随气候和生活条件而改变的面色是（）
A. 常色
B. 主色
C. 客色
D. 病色
E. 善色
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不定期更改网管用户的登录口令应当作为每月维护项目执行。
A. 正确
B. 错误
Which of the following statements is true concerning any evaporator?（）
A. High conductivity of the distillate indicates distillate salinity is excessive
B. Increasing the absolute pressure of the shell will increase the distillers capacity
C. Mesh separators are used in evaporators to filter the distillate
D. Reducing the brine density will reduce the heat lost overboard
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