集成运算放大器是由哪几部分构成的？
参考答案：
集成运算放大器是由输入级、中间级、输出级和偏置电路四部分组成。
The government plans to bring in new laws _____ parents to take more responsibility for the education of their children．
A．forced
B．forcing
C．to be forced
D．having forced
无框玻璃门应采用厚度不小于（）mm的钢化玻璃。
A.8
B.10
C.12
D.15
