A、5 seconds
B、10 seconds
C、15 seconds
D、20 seconds
更多“How long warning must be provided by the CO<sub>2</sub> warning Mann before CO<sub>2</sub> is discharged into a space （）.”相关的问题
A、How ofen do the course？ B、How about the flavour of this course？ C、How long does it preparefor dinner？ D、How long does it take to cook this course？
A、The topics for warnings included in HYDROLANTS，HYDROPACS，and NAVAREA warnings are the same B、NAVAREA warnings concern only coastal navigation and inland navigation in large bays or sounds such as Puget Sound C、The United States is responsible for NAVAREA warnings in the North Atlantic north of 7°N，and west of 15°W D、Long range radio navigational warnings are usually broadcast by radiotelephone，radiotelegraph，and radio-teletypewriter
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