反应器压差增大可能有两点；一是（）：二是（）.
参考答案：催化剂结焦；升降压速度过快，催化剂破碎
In zones where earthquakes are known to occur, ______ construction techniques can significantly reduce the effects of seismic wave.
A．to improve
B．improving
C．improved
D．being improving
视觉电生理检查法
