A pumproom is suspected of accumulating gases after a ventilation machinery breakdown. Where should the combustible gas indicator case be placed when testing the pumproom atmosphere for combustible gases?（）.
1、An example of a messenger is a（）.
An example of a messenger is a（）.AfairleadBheaving lineCstayDwar
A millibar is a unit of（）.AhumidityBprecipitationCpressureDtemperature
3、Grammar is a description of the（）of a
Grammar is a description of the（）of a language and the way in which linguistic units such as words and phrases are combined to produce sentences in the language.
4、A historical study of language is a （）
A historical study of language is a （）study of language.AsynchronicBdiachronicCprescriptiveDcomparative
5、What is a consequence of installing a
What is a consequence of installing a Cisco End-to-End Solution?（）A Different Support Contracts with multiple vendorsB Difficulty implementing network servicesC Solid investment protectionD Poor Investment Protectio
6、Should any case or suspected case of q
Should any case or suspected case of quarantinable disease，or any case of eruptive disease or any death be discovered，the local Quarantine Officer must be（）immediately.AnotedBnoticedCnotifiedDnotificated