影响课堂管理的因素包括教师的______、班级规模、班级的性质以及对教师的期望。
参考答案：领导风格
被减数不变，当减数增加600时，差[ ]
A．不变
B．增加600
C．减少600
A warning signal suddenly appeared on the screen of my computer, ______ the computer was being attacked by a certain virus.
A．indicated
B．indicating
C．to indicate
D．having indicated
