汽轮机超速只与保护系统有关系，而与调节系统无关。
参考答案：错
Raffle tickets numbered consecutively from 101 through 350 are placed in a box. What is the probability that a ticket selected at random will have a number with a hundreds digit of 2 ？（）
A.A
B.B
C.C
D.D
E.E
在运行程序时，在程序代码中改变文本框的Text属性值，或在文本框中输入新的内容，相应会触发( )事件。
A．GotFocus
B．Click
C．Change
D．DblClick
