单项选择题
A.one B.two C.three D.four
Fire drill is carried out once a （）.A.yearB.dayC.weekD....
单项选择题Fire drill is carried out once a （）.
A.year B.day C.week D.month
Any emergency pump situated （）machinery space should al...
单项选择题Any emergency pump situated （）machinery space should also be started.
A.outside B.under C.beside D.besides
On hearing the fire signal, the crew should proceed imm...
单项选择题On hearing the fire signal, the crew should proceed immediately to （）their assigned duties.
A. carry on B. put out C. carry out D. take off
