题目内容

冲击式吸收管适用于采集气溶胶和烟状物质，一般不适用于气体或蒸气状物质。

A. 对
B. 错

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根据解吸方法的区别，活性炭管分为溶剂解吸型活性炭管和热解吸型活性炭管两种

A. 对
B. 错

When language is used to get information from others, it serves ( )function.

A. phatic
B. an interrogative
C. an informative
D. an expressive

The distinction between"langue"and"parole"was made by ( )

A. F de Saussure
B. Noam Chomsky
C. M.A.halliday
D. Bloomfield

The function of the sentence “Water boils at 100 degree centigrade.” is ( ).

A. Interrogative
B. Directive
C. Informative
D. Performative