The analysis of time history is an important structure of a main seismic design method, its primary problem is the input of seismic motion.
时程计算分析是重要结构物抗震设计的一个主要方法，输入地震动是地震时程计算分析的首要问题。
The utility model can be used for switching two kinds of gas as well as correct adjusting the air input of the primary admission port with the air supply difference, thereby having a simple structure.
它既能用于两种燃气转换使用，又能随气源不同而适当调节一次进气口空气进气量，结构简单。
The utility model can be used for switching two kinds of gas as well as correct adjusting the air input of the primary admission port with the air supply difference, thereby having a simple structure.
它既能用于两种燃气转换使用，又能随气源不同而适当调节一次进气口空气进气量，结构简单。
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