题目内容

Modern linguistics is ____in the sense that the linguist tries to discover what language is rather than lay down some rules for people to observe.

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Linguists have to observe and collect linguistic____before they can do anything else.

Language is symbolic, so each word serves as a ____in relation to a specific meaning.

Design features

甲烷的LEL是5.0%,甲烷的一级报警值应设定在（）

A. 1. 25%
B. 2. 5%
C. 0. 625%
D. 0.5%