spectrum selectivity

Due to the frequency selectivity and high insertion loss of SAW device, the input must be high pulse whose spectrum width can cover the center frequency of SAW tap delay line.

由于SAW器件具有频率选择性及较高的插入损耗，使得它的输入必须为高脉冲且脉冲的频谱宽度能覆盖SAW抽头延迟线的中心频率。

The sulfonylurea herbicides have been characterized by broad-spectrum good crop selectivity and low mammalian toxicity.

磺酰脲类除草剂是近二十年来开发成功的一类超高效、 广谱 、低毒和高选择性的除草剂,问世以来受到人们的极大关注,得到较为深入的研究.

In comparison with other techniques, the LIF spectrum technique possesses advantages of superior selectivity and sensitivity.

与其他光谱技术相比, 激光诱导荧光光谱技术具有极高的选择性和灵敏度.