《建筑消防安全检测评价技术规程》规定,水喷雾灭火系统采用传动管传输火灾信号时,传动管的长度不宜大于()
A.100m
B.200m
C.300m
D.400m
参考答案:C
平衡舵有利于()。
A.减小舵叶面积
B.减少舵机负荷
C.增大转船力矩
D.增快转舵速度
A chain bridle is used when towing astern because it().
A.is easy to connect
B.provides an effective catenary and absorbs shock due to its weight
C.makes rigging a swivel unnecessary
D.prevents the tow from yawing by the drag of the chains in a seaway