A device fitted over the discharge opening on a relief valve consisting of one or two woven wire fabrics is called a flame().
A、A.stopper
B、B.screen
C、C.filter
D、D.restrictor
A、A.stopper
B、B.screen
C、C.filter
D、D.restrictor
A、A.Speed limiting governor B、B.Over-speed governor C、C.Over-speed trip D、D.Over-speed relay
A、wireless monitoring device B、wireless LAN controller C、wireless bridge D、wireless management device E、access point
A、termination devices need routable addresses inside the VPN B、termination devices need not routable addresses inside the VPN C、IGP routing protocols will update their routing tables over anIPsec VPN D、addressing designs need to allow for summarization
A、An alarm device with audible and visible signals is required for all cooling water systems B、Propulsion engines with bores over 200 mm are to be fitted with cooling water jackets C、Each totally enclosed cooling system shall be provided with a suitable head tank D、Drain cocks are to be provided at the lowest points of all cylinder water jackets