为了查明案情，在必要的时候，经公安局长批准，可以进行侦查实验。( )
参考答案：对
解析： 略
I ______ to the lecture that afternoon, but I ______ a bit ill.
A．should have gone; was
B．would have gone; had been
C．should go; was
D．would go; had been
属于分离设备的有( )。
A．变换炉
B．蒸发器
C．集油器
D．吸收塔
