Using the highly-integrated Switch-Capacitor filter, the sampling rate and the cut-off frequency of the anti-alias filter can be arbitrarily selected within some range.
并采用高集成度的开关电容滤波器，系统的采样频率和反混迭滤波器的截止频率可在一定范围内任意给定。
The initial forms of tensile membrane structures can not be selected arbitrarily. They must satisfy static equilibrium and architectural need.
张力膜结构的初始形状不能随意选择，它必须符合平衡条件和建筑使用要求。
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