Based on surveys of the current situations in practical teaching of Liberal Arts curriculum, the author points out the existent problems from five perspectives.
本文作者根据对当前文科课程实践教学实施情况的调查，指出现存五个方面的问题。
Starting from analyzing the current situations of grating digital geophone, the paper analyzed in detail the principle of grating digital geophone and processing approaches of output signals.
本文从分析数字检波器的现状着手，对光栅数字检波器的原理及其输出信号的处理方法进行了详尽地分析。
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