风筒工需要掌握《煤矿安全规程》对选用风筒的有关规定。
参考答案：对
机组滑停时应根据负荷及除氧器压力及时将（）切至（）。
All portable fire extinguishers must be capable of being（）.
A.carried by hand to a fire
B.carried or rolled to a fire
C.recharged in the field
D.used on class 'B' fires
