当温度升高时，晶体三极管集电极电流Ic（），发射结压降（）。
参考答案：增加；减小
But the next thing I knew, the car stopped, the airbags had , the windscreen broke, and smoke was coming out．
A．broken off
B．gone off
C．cut off
D．turned off
何为串级控制系统？
