凝结水产生过冷却的原因有（）。
A、凝汽器汽侧积空气；
B、循环水温度过低；
C、循环水量过大；
D、凝汽器水位过高。
参考答案：A, D
根据首字母及汉语提示，完成下列单词的拼写，使句意通顺。
1. Do you think this kind of water is s_____(安全) for drinking?
2. He is writing on the blackboard with a piece of c_____ (粉笔).
3. Our teachers are all very s_____ (严格) with us students.
4. Tom i_____ (邀请) all his best friends to his birthday party last Sunday.
5. We have to c_____ (携带) a lot of books in our school bags every day.
关于Move方法，下列叙述正确的是
A．用来移动窗体和控件，不能改变其大小
B．“对象”是窗体时，移动基准以屏幕左边界和上边界为准
C．Move方法移动除计时器以外的所有标准控件
D．“对象”是控件时，移动基准以屏幕左边界和上边界为准
